NURHALIMAH, A.; MANDAILINA, V.; MAHSUP; SYAHARUDDIN. Measuring the Difficulty Level of Mathematical Problems Based on Polya Criteria. Journal of Education Research and Evaluation, [S. l.], v. 6, n. 4, p. 595–607, 2022. DOI: 10.23887/jere.v6i4.46316. Disponível em: https://ejournal.undiksha.ac.id/index.php/JERE/article/view/46316. Acesso em: 18 jul. 2024.