Problem-Based Learning Associated by Action-Process-Object-Schema (APOS) Theory to Enhance Students’ High Order Mathematical Thinking Ability. International Journal of Research in Education and Science, [S. l.], v. 2, n. 1, p. 125–135, 2016. Disponível em: https://ijres.net/index.php/ijres/article/view/819. Acesso em: 8 jun. 2025.