Nurjanah

@upi.edu

Department of Mathematics Education Faculty of Mathematics and Natural Sciences
Universitas Pendidikan Indonesia

Nurjanah


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https://researchid.co/nurjanahupi.edu
Nurjanah was born in Purwakarta, West Java, Indonesia on November 16, 1965. She began elementary education at SDI Singawinata 2 Purwakarta in 1972 and continued her junior high school at SMP Negeri 1 Purwakarta in 1978. Then she continued her education at SMA Negeri 1 Purwakarta in 1981 In accordance with his interests, he continued his studies at the Teachers and Education Institute of Bandung in 1984 majoring in mathematics education. He then took a master's program in mathematics education in 1990 at the State University of Malang which enabled him to teach discrete mathematics courses, mathematics learning planning, evaluation of mathematics learning, mathematics teaching and learning strategies, mathematics learning media and mathematics education problem studies. In 2010 he continued his mathematics education doctoral program at an Indonesian university of education. He has done extensive research on the development of hands-on activities and computer-based media whose products are published in highly reputable journals.

RESEARCH INTERESTS

Development of media-based hands-on activities and computer-based learning media
24

Scopus Publications

6176

Scholar Citations

35

Scholar h-index

191

Scholar i10-index

Scopus Publications

  • The Effect of GeoGebra-Assisted Discovery Learning Considering Emotional Stability on the Achievement of Mathematical Reasoning
    Mathematics Teaching Research Journal, 2025
  • Exploring three-dimensional geometry using praxeological analysis: Indonesian textbook insights
    Ratri Isharyadi, Nurjanah
    Journal on Mathematics Education, 2025
    The integration of three-dimensional geometry in secondary mathematics education plays a crucial role in developing students' spatial reasoning and problem-solving skills. However, textbooks often present limitations in structuring tasks, techniques, and justifications, which may lead to learning obstacles. Despite the importance of well-designed instructional materials, there is a lack of comprehensive studies analyzing Indonesian mathematics textbooks using both the praxeological framework and the learning obstacles perspective in didactic situations. Addressing this gap, this study examines a Grade XII mathematics textbook in Indonesia, focusing on three-dimensional geometry through a structured content analysis. The analysis categorizes tasks based on praxeological components, including types of tasks, solution techniques, technological justifications, and supporting theories, while also identifying potential learning obstacles related to the clarity of visual representations and contextual problem diversity. The findings reveal that the textbook includes 10 types of tasks, solved using 6 techniques, supported by 7 forms of technological reasoning, all grounded in three-dimensional geometry concepts. The presentation of tasks is systematically structured and balances conceptual and procedural aspects, minimizing significant didactic obstacles. However, epistemological obstacles were identified, primarily due to limited visualizations and a lack of diverse contextual tasks, which may hinder students’ flexibility in applying three-dimensional geometry concepts. These findings highlight the need for improved task design and enhanced visual representations to foster deeper conceptual understanding and adaptability in problem-solving. This study contributes to mathematics education research by providing empirical insights into textbook design and its impact on students' learning processes, offering recommendations for more effective instructional material development.
  • Development of a STEM-based Digital Learning Space to Increase Students' Mathematical Creativity in Borderless Classrooms
    R. Yuliardi, Y. S. Kusumah, Dadang Juandi, Nurjanah
    Aip Conference Proceedings, 2024
  • Bibliometric Analysis of Augmented Reality Research Trends in Education
    Ratri Isharyadi, Nurjanah, Riska Novia Sari, Marfi Ario, Herizal
    Aip Conference Proceedings, 2024
  • Development of a STEM-based digital learning space platform to enhance students’ mathematical creativity in future learning classrooms
    Ricki Yuliardi, Yaya Sukjaya Kusumah, Nurjanah Nurjanah, Dadang Juandi, Suparman Suparman
    Eurasia Journal of Mathematics Science and Technology Education, 2024
    This study focuses on developing a web-based digital learning space (DLS) designed to support a STEM learning model that fosters students’ mathematical creativity. The DLS builds upon traditional learning management systems by introducing customizable elements tailored to individual teaching and learning environments (PTEs and PLEs). These features allow for the formation of diverse learning networks within the DLS. This enhanced version integrates frameworks for STEM learning, engaging activities, instructional videos, quizzes, evaluations, feedback tools, and a chat feature for direct communication with instructors. The research and development process employed a 4D model–define, design, develop, and disseminate–and involved validation from content and media experts, confirming the DLS’s reliability for broader testing. Results indicate that the STEM-based DLS is highly suitable for mathematics education, as shown by validation from experts, practicality tests from users, and effectiveness tests that measured students’ mathematical creativity. This study also found moderate improvement in students’ creative mathematical thinking (Ng = 0.554) within classrooms using the STEM-based DLS, highlighting its effectiveness for enhancing these skills. Thus, this STEM-focused DLS offers a mobile-friendly digital environment that effectively promotes students’ mathematical creativity.
  • The Effect of Think-Pair-Share Cooperative Learning on Students' Mathematical Communication Ability in Indonesia: Meta-Analysis Study
    Nindya Langen Luthfiani, Nurjanah
    Aip Conference Proceedings, 2022
    This meta-analysis study was conducted to examine the overall effect of utilizing the Think-Pair-Share (TPS) Cooperative Learning (CL) model on students' mathematical communication ability and to analyze the degree of variation between each study. One hundred four articles were published between 2015 until 2020 and examined for research purposes; ten articles were obtained that met the eligibility for analysis. The studies' samples are High School and Junior High School students. Comprehensive Meta-Analysis (CMA) program utilized as an examination device. The effect-size index of the Hedges-g equation is obtained and decided based on the random-effect model estimation. It comes about appeared that the overall effect measure of the application of TPS CL on students' mathematical communication abilities was 0.826, there implies that there is a positive effect that's very high in this finding, with a standard error of 0.247. So these discoveries show that the application of TPS CL in Indonesia is quite viable in making strides in students' mathematical communication abilities. Analysis of the level of study variation was critical in terms of “differences in education levels.” These discoveries demonstrate that the TPS-type CL show is more compelling at the Junior High School level.
  • The Learning Obstacles in Solving Geometry Problems Based on Spatial Ability in Term of Van Hiele Level
    Anggi Juliana, Nurjanah, Dian Usdiyana
    Aip Conference Proceedings, 2022
    Students experiences in gaining an understanding of the concept of geometry when learning geometry can be identified through how students solve geometry problems based on spatial abilities. Therefore, this reality is important for further research. This study aims to identify student learning obstacles in learning geometry based on geometric problem solving based on spatial abilities in terms of Van Hiele levels. This research is a qualitative descriptive study involving 60 9th grade students who have studied the material of flat face three dimensional objects. The data collected through a test and depth-interview. The interview was transcribed and then carried out an in-depth analysis to identify possible learning obstacles. The results of this study indicate that in solving geometrical problems based on spatial ability students can be categorized into students at level 0, level 1, and level 2. Based on these three categories, it can be concluded that there are student learning obstacles includes ontogenic, didactic, and epistemological obstacles, in solving geometrical problems based on their spatial abilities.
  • Flat plane geometry learning media through macromedia flash CS3 program in online mathematics learning
    Nurjanah, JA Dahlan, Y Wibisono
    Journal of Physics Conference Series, 2021
    A learning media is one of the many tools that are being developed by teachers to help students learn mathematics. Because of that, the learning media must be designed to fit the students’ characters. Junior high school students need a learning media that fits with the level of concrete thinking so that students are able to adapt the mathematical knowledge that are beginning to get abstract. For this purpose, scientists have tried to improve the learning media that are technology based using Adobe Flash CS3 program. The technology-based learning media using Adobe Flash CS3 have been tested in online learning practices which took part 124 students from several junior high schools in Bandung, as well as math teachers as observers. The results of this implementation show that improved computer-based learning media are responded positively by students. The students feel motivated to study, focused, and highly curious. This response is supported by their comments that the improved media is appealing, well organized system, and the animation has helped them to understand the material.
  • Error analysis in solving the linear equation system of three variables using Polya's problem-solving steps
    R B Wiyah, Nurjanah
    Journal of Physics Conference Series, 2021
    Recently, students still often have difficulties and share common mistakes in solving the linear equation system of three variables. This qualitative descriptive research describes the errors and causes of students’ errors in solving the linear equation system of three variables using Polya’s problem-solving steps. The subjects were 33 students of Grade 10 Science at one of the Senior High School in Indralaya. The data collection techniques used observation, student worksheets, and interviews. The results showed there were several students’ errors and the causes of students’ errors in solving the problems. These errors are errors in identifying the known and asked information, errors in making mathematical models of problems, errors in calculations, errors in arranging the linear equation system of three variables, and errors in giving valid reasons for their answers. The causes of these errors are the limited time for understanding the problem, careless in doing calculations, forgetting the formulas, and lacking understanding of variables concept.
  • Ethnomathematics study of Minangkabau tribe: formulation of mathematical representation in the Marosok traditional trading
    Nurjanah Nurjanah, Isra Mardia, Turmudi Turmudi
    Ethnography and Education, 2021
    This research aims to explore the use of ethnomathematics in revealing mathematical representations and in the formulation of a calculation system used in the Marosok trading tradition by the Minangkabau tribe in West Sumatra. Ethnomathematics studies ideas in various cultural activities practiced by ethnic, social, or professional groups. The tradition involves nonverbal communication, such as shaking hands with ‘Marosok’ or touching covered fingers to obtain price agreements in trading livestock. Therefore, this study was conducted using qualitative approaches and the ethnographic method via field notes, unstructured interviews, and documentation studies. The findings showed that mathematical representations of finger symbols and gestures in the Marosok Tradition contain basic numbers. These include half, one, two, two and a half, three, four, five, etc. with functions, such as addition and subtraction, which are used to obtain other numbers needed in livestock trading transactions using specific formulas.
  • Computer-assisted learning using the Cabri 3D for improving spatial ability and self- regulated learning
    Nurjanah, Burhanuddin Latif, Ricki Yuliardi, Maximus Tamur
    Heliyon, 2020
  • Learning mathematics assisted by adobe flash software to improve mathematical reasoning ability students ongeometry concepts
    Nurjanah, R Yuliardi, A F Luthfi
    Journal of Physics Conference Series, 2020
  • Ethnomathematics study: Formalizing mathematical representation in the Marosok trading tradition in Minangkabau
    I Mardia, Turmudi, Nurjanah
    Journal of Physics Conference Series, 2020
  • Contributions of Self-Regulated Learning, Disposition Mathematically and Habits of Mind Against Mathematical Problem Solving Ability Students
    Nurul Hasibuan, Nurjanah Nurjanah
    Proceedings of the 7th Mathematics Science and Computer Science Education International Seminar Msceis 2019, 2020
  • The Effect of Learning Hands-on Activity Media on the Mathematical Reasoning Ability of Junior High School Students
    Nurjanah Nurjanah, J Dahlan, Y Wibisono
    Proceedings of the 7th Mathematics Science and Computer Science Education International Seminar Msceis 2019, 2020
  • The Effect of Hands-On and Computer-Based Learning Activities on Conceptual Understanding and Mathematical Reasoning
    Nurjanah Nurjanah, , Jarnawi Afgani Dahlan, Yudi Wibisono, , and
    International Journal of Instruction, 2020
  • A labyrinth game for blind children using problem solving learning model
    Lala Septem Riza, Tyas Sawiji, Nurjanah Nurjanah, Haviluddin Haviluddin, Edy Budiman, Alejandro Rosales-Pérez
    International Journal of Emerging Technologies in Learning, 2020
  • The Work Posture Assessment Towards Musculoskeletal Disorders in Coloring Activities of Indonesian Hand Drawn Batik
    Siswiyanti, Rusnoto, Saufik Luthfianto, Nurjanah, Arif Zainudin
    Journal of Physics Conference Series, 2019
  • Development of media model based on hands-on activity to improve conceptual understanding abilities of junior high school students in Bandung district
    Nurjanah, J A Dahlan, Y Wibisono
    Journal of Physics Conference Series, 2019
  • Learning obstacles on the concept of function: A hermeneutic phenomenological study
    S R Septyawan, D Suryadi, Nurjanah
    Journal of Physics Conference Series, 2019
  • Improving self-regulated learning junior high school students through computer-based learning
    Nurjanah, J A Dahlan
    Journal of Physics Conference Series, 2018
  • Mathematics Learning Assisted Geogebra using Technologically Aligned Classroom (TAC) to Improve Communication Skills of Vocasional High School Student
    R Yuliardi, Nurjanah
    Journal of Physics Conference Series, 2017
  • Improvement of the ability of junior high school students thinking through visual learning assisted geo gbra tutorial
    M Elvi, Nurjanah
    Journal of Physics Conference Series, 2017
  • Design and Development Computer-Based E-Learning Teaching Material for Improving Mathematical Understanding Ability and Spatial Sense of Junior High School Students
    Nurjanah, J A Dahlan, Y Wibisono
    Journal of Physics Conference Series, 2017

RECENT SCHOLAR PUBLICATIONS

  • A didactical transposition study on secondary students’ number sense of integers
    P Fitriasari, D Suryadi, E Nurlaelah, S Suhendra, H Hermanto, YL Ningsih
    Frontiers in Education 11, 1739073 , 2026
    2026
  • Analisis Materi Bilangan Rasional pada Buku Teks Matematika Siswa SMP Kelas VII berdasarkan Praxeology Theory
    MG Abdulrafi, N Nurjanah
    Circle: Jurnal Pendidikan Matematika 6 (1), 1-17 , 2026
    2026
  • Ethnomathematics-based guided discovery learning using Gedung Sate to enhance junior high school students’ mathematical connection ability
    V Virliani, W Wahyudin, N Priatna, T Turmudi
    Indonesian Journal of Science and Mathematics Education 9 (1), 221-233 , 2026
    2026
  • STUDENT STRATEGIES AND ERRORS IN SOLVING MATHEMATICAL REPRESENTATION PROBLEMS ON A QUADRATIC FUNCTION MATERIAL
    HM Siregar, N Nurjanah, T Turmudi, D Darhim, E Nurlaelah
    AKSIOMA: Jurnal Program Studi Pendidikan Matematika 15 (1) , 2026
    2026
  • Junior high school students’ onto-semiotic approach in solving AKM-oriented algebra numeracy problems based on VARK learning styles
    R Hidayat, T Turmudi, JA Dahlan, E Nurlaelah
    Indonesian Research Journal in Education| IRJE| 10 (1), 600-615 , 2026
    2026
  • Integrating markerless augmented reality into project-based learning to foster spatial reasoning and self-regulated learning in junior high school: A formative evaluation
    R Isharyadi, YS Kusumah, N Nurjanah, BAP Martadiputra
    International Journal of Didactic Mathematics in Distance Education 3 (1 … , 2026
    2026
  • Implementasi dan Pengaruh Kerangka Kerja TPACK dalam Pendidikan Matematika: Sebuah Tinjauan Literatur Sistematis
    R Djatnika, N Nurjanah
    Polinomial: Jurnal Pendidikan Matematika 5 (1), 266-278 , 2026
    2026
  • From Traditional to Digital: A Mini Review on Flipped Classroom in Mathematics Education
    AD Putri, D Juandi, MM Melissa, D Fardian, A Jupri, T Turmudi
    SJME (Supremum Journal of Mathematics Education) 10 (1), 37-53 , 2026
    2026
  • PENERPAN KEGIATAN MENGANYAM UNTUK MENINGKATKAN KEMAMPUAN MOTORIK HALUS PADA ANAK USIA 5-6 TAHUN DI TK PLUS WAHIDIYAH
    N Nurjanah
    Universitas PGRI Madiun , 2026
    2026
  • PENGUATAN LITERASI DAN KETAHANAN KELUARGA MELALUI SEMINAR PENGASUHAN, GIZI, DAN PERLINDUNGAN IBU-ANAK DI DESA RANGDUMULYA
    S Nurkomalasari, S Karmila, N Nurjanah, Y Yanah, DD Mahendra, ...
    Publikasi Ilmiah Bidang Pengabdian Kepada Masyarakat (SIKEMAS) 4 (4), 61-69 , 2026
    2026
  • Mapping errors in solving linear equations: A hermeneutic phenomenological study
    AD Putri, T Baba, D Juandi, T Turmudi, A Jupri
    Infinity Journal 15 (1), 37-58 , 2026
    2026
  • Learning Trajectory of Trigonometric Ratios Applying Realistic Mathematics Education
    D Andiani, D Darhim, E Nurlaelah
    MATHEMATICS TEACHING RESEARCH JOURNAL 18 (1), 124-151 , 2026
    2026
  • Tren Penelitian Kemampuan Representasi Matematis dalam Jurnal Pendidikan Matematika Berorientasi Sustainable Living di Indonesia: Tinjauan dari Desain Penelitian sampai …
    D Andiani, D Darhim, E Nurlaelah, F Azis
    Jurnal Riset Pendidikan Matematika Jakarta 8 (1), 27-39 , 2026
    2026
  • Eksplorasi Hambatan Kognitif Siswa dalam Membangun Representasi Matematis Berdasarkan Teori APOS sebagai Dasar Strategi Pembelajaran Fungsi Kuadrat
    HM Siregar, N Nurjanah, D Darhim, T Turmudi
    Prosiding Pendidikan Sains dan Humaniora 2 (1), 98-117 , 2025
    2025
  • ANALISIS PERANAN KONSEP ALJABAR LINEAR DALAM PENGEMBANGAN SISTEM KECERDASAN BUATAN (AI)
    N Nurjanah, F Amelia, A Febriana, QK Sidiq
    JURNAL SILOGISME: Kajian Ilmu Matematika dan Pembelajarannya 10 (02), 101-110 , 2025
    2025
  • Validation of CORE-Model-Based Geometry Teaching Materials Supported by Wingeom Software
    S Yulianti, D Darhim, BAP Martadiputra, JA Dahlan
    AL-ISHLAH: Jurnal Pendidikan 17 (4) , 2025
    2025
  • EXPLORING FRIEZE PATTERNS IN LOTIS AMANUBAN WOVEN FABRICS: INTEGRATION OF TEKE AND BIKLUSU MOTIFS INTO MATHEMATICS EDUCATION
    F Daniel, T Turmudi, D Juandi, K Kusnandi
    AKSIOMA: Jurnal Program Studi Pendidikan Matematika 14 (4) , 2025
    2025
  • Systematic Literature Review: Hambatan Belajar Siswa Dalam Menyelesaikan Soal Cerita
    S Despitasari, N Nurjanah
    Tirtamath: Jurnal Penelitian dan Pengajaran Matematika 7 (2) , 2025
    2025
  • Students’ Errors and Learning Obstacles in Solving Algebraic Word Problems: Hermeneutic Phenomenology
    M Ario, Suhendra, A Jupri, E Nurlaelah
    Education Sciences 15 (12), 1674 , 2025
    2025
    Citations: 9
  • Discovery Learning: Meningkatkan Keterampilan Kolaborasi dan Komunikasi Matematis Siswa dalam Pembelajaran Matematika
    EN Baiti, N Nurmadina, D Novitasari, N Nurjanah
    Jurnal Didaktika Pendidikan Dasar 9 (3), 955-976 , 2025
    2025
    Citations: 1

MOST CITED SCHOLAR PUBLICATIONS

  • The importance of science, technology, engineering, and mathematics (STEM) education to enhance students’ critical thinking skill in facing the industry 4.0
    RN Hafni, T Herman, E Nurlaelah, L Mustikasari
    Journal of Physics: Conference Series 1521 (4), 042040 , 2020
    2020
    Citations: 161
  • Enhancing students’ interest through mathematics learning
    A Azmidar, D Darhim, JA Dahlan
    Journal of Physics: Conference Series 895 (1), 012072 , 2017
    2017
    Citations: 123
  • Implementasi STEM dalam meningkatkan kemampuan berpikir kritis dan kreatif matematis
    L Rahmawati, D Juandi, E Nurlaelah
    AKSIOMA: Jurnal Program Studi Pendidikan Matematika 11 (3), 2002 , 2022
    2022
    Citations: 119
  • Penerapan pembelajaran matematika realistik berbantuan geogebra untuk meningkatkan kemampuan komunikasi matematis siswa SMP
    D Nopiyani, T Turmudi, S Prabawanto
    Mosharafa 5 (2), 45-52 , 2016
    2016
    Citations: 99
  • Pengembangan Lembar Kerja Siswa Berbasis Masalah dengan Strategi Heuristic untuk Meningkatkan Kemampuan Literasi Matematis
    MN Prabawati, T Herman, T Turmudi
    Mosharafa: Jurnal Pendidikan Matematika 8 (1), 37-48 , 2019
    2019
    Citations: 89
  • Pengaruh Penerapan Online Project Based Learning Dan Berpikir Kreatif Terhadap Keterampilan Proses Sains Siswa Kelas IV Pada Pelajaran IPA Di SD Nasional 1 Kota Bekasi
    N Nurjanah, U Cahyana
    Buana Pendidikan: Jurnal Fakultas Keguruan dan Ilmu Pendidikan Unipa … , 2021
    2021
    Citations: 82
  • Analisis hambatan belajar pada materi pecahan
    N Ulfa, A Jupri, T Turmudi
    Research and Development Journal of Education 7 (2), 226-236 , 2021
    2021
    Citations: 80
  • Mendesain soal berbasis masalah untuk kemampuan berpikir kritis matematis calon guru
    EA Afriansyah, T Herman, T Turmudi, JA Dahlan
    Mosharafa: Jurnal Pendidikan Matematika 9 (2), 239-250 , 2020
    2020
    Citations: 80
  • Pemberian scaffolding untuk memperbaiki proses berpikir komputasional siswa dalam memecahkan masalah matematika
    MG Supiarmo, L Mardhiyatirrahmah, T Turmudi
    Jurnal Cendekia 5 (1), 368-382 , 2021
    2021
    Citations: 79
  • Proses berpikir komputasional siswa dalam menyelesaikan soal pisa konten change and relationship berdasarkan self-regulated learning
    MG Supiarmo, T Turmudi, E Susanti
    Numeracy: Jurnal Ilmiah Pendidikan Matematika 8 (1), 58-72 , 2021
    2021
    Citations: 71
  • Analysis of mathematical abstraction on concept of a three dimensional figure with curved surfaces of junior high school students
    N Fitriani, D Suryadi, D Darhim
    Journal of Physics: Conference Series 1132 (1), 012037 , 2018
    2018
    Citations: 64
  • Mathematics self efficacy and mathematics performance in online learning
    HRP Negara, E Nurlaelah, Wahyudin, T Herman, M Tamur
    Journal of Physics: Conference Series 1882 (1), 012050 , 2021
    2021
    Citations: 63
  • Constructing and providing content validity evidence through the Aiken's Vindex based on the experts' judgments of the instrument to measuremathematical problem-solving skills
    N Kania, YS Kusumah, JA Dahlan, E Nurlaelah, F Gürbüz, E Bonyah
    REID (Research and Evaluation in Education) 10 (1), 5 , 2024
    2024
    Citations: 62
  • THE STUDENTS'MATHEMATICAL ABSTRACTION ABILITY THROUGH REALISTIC MATHEMATICS EDUCATION WITH VBA-MICROSOFT EXCEL
    N Fitriani, D Suryadi, D Darhim
    Infinity Journal 7 (2), 123-132 , 2018
    2018
    Citations: 60
  • Providing Online Learning Situations for In-Service Mathematics Teachers' External Transposition Knowledge during COVID-19 Pandemic: Case of Indonesia.
    M Marfuah, D Suryadi, T Turmudi, MG Isnawan
    Electronic Journal of E-Learning 20 (1), 69-84 , 2022
    2022
    Citations: 55
  • Penerapan hybrid learning di perguruan tinggi indonesia: Literatur review
    Y Helsa, R Marasabessy, D Juandi, T Turmudi
    Jurnal Cendekia: Jurnal Pendidikan Matematika 7 (1), 139-162 , 2022
    2022
    Citations: 54
  • Mathematical comic media for problem solving skills
    S Adi Widodo, T Turmudi, J Afgani Dahlan, I Istiqomah, H Saputro
    Proceedings of the Joint Workshop KO2PI and the 1st International Conference … , 2018
    2018
    Citations: 54
  • Realistic mathematics education and mathematical literacy: a meta-analysis conducted on studies in Indonesia
    AD Putri, D Juandi, T Turmudi
    Journal of Education and Learning (EduLearn) 18 (4), 1468-1476 , 2024
    2024
    Citations: 52
  • Analysis of students error in mathematical problem solving based on Newman’s error analysis
    HN Fitriani, T Turmudi, S Prabawanto
    International Conference on Mathematics and Science Education 3 (1), 791-796 , 2018
    2018
    Citations: 51
  • Analisis kesalahan siswa dalam menyelesaikan soal tes kemampuan berpikir kreatif matematis materi Lingkaran
    HM Siregar
    AKSIOMA: Jurnal Program Studi Pendidikan Matematika 8 (3), 497-507 , 2019
    2019
    Citations: 50