AMBRUS, A.; BARCZI-VERES, K. Using open problems and cooperative methods in mathematics education. LUMAT: International Journal on Math, Science and Technology Education, [S. l.], v. 3, n. 1, p. 3–18, 2015. DOI: 10.31129/lumat.v3i1.1048. Disponível em: https://journals.helsinki.fi/lumat/article/view/1048. Acesso em: 3 jul. 2024.