Siburian R, Simanjuntak SD, Simorangkir FM. Effectiveness of online differentiated instruction in term of students’ mathematical problem solving ability. J. ris. pendidik. mat [Internet]. 2022 May 31 [cited 2025 May 10];9(1). Available from: https://journal.uny.ac.id/index.php/jrpm/article/view/44439