Vetseva Е. A problem-based approach in teaching progressions. Mathematics and Education in Mathematics, [S. l.], v. 52, p. 154–165, 2023. DOI: 10.55630/mem.2023.52.154-165. Disponível em: https://smb.math.bas.bg/mem/index.php/memjournal/article/view/81. Acesso em: 7 oct. 2026.