Khairani N, Muslimin M. The Efforts to Improve Mathematics Learning Outcomes in Sequences and Series Materials Using a Problem Based Learning Model with a Differentiated Strategy. PIJED [Internet]. 2024 Sep. 30 [cited 2026 Jul. 10];3(2):147-60. Available from: https://ejournal.ppsdp.org/index.php/pijed/article/view/268