SAPTA, A.; PAKPAHAN, S. P.; SIRAIT, S. Using The Problem Posing Learning Model Based On Open Ended To Improve Mathematical Critical Thinking Ability. Journal of Research in Mathematics Trends and Technology, [S. l.], v. 1, n. 1, p. 12–15, 2019. DOI: 10.32734/jormtt.v1i1.752. Disponível em: https://talenta.usu.ac.id/jormtt/article/view/752. Acesso em: 4 sep. 2025.