Khairani, Neneng, and Muslimin Muslimin. “The Efforts to Improve Mathematics Learning Outcomes in Sequences and Series Materials Using a Problem Based Learning Model With a Differentiated Strategy”. PPSDP International Journal of Education 3, no. 2 (September 30, 2024): 147–160. Accessed July 10, 2026. https://ejournal.ppsdp.org/index.php/pijed/article/view/268.