1.
Nurlaily VA, Soegiyanto H, Usodo B. Elementary school teacher’s obstacles in the implementation of problem-based learning model in mathematics learning. j. math. educ. [Internet]. 2019 May 2 [cited 2025 Jul. 29];10(2):229-38. Available from: https://jme.ejournal.unsri.ac.id/index.php/jme/article/view/3790