REINHARD OLDENBURG. Algebra at the Meta and the Object Level . Turkish Journal of Computer and Mathematics Education (TURCOMAT), [S. l.], v. 6, n. 3, p. 366–379, 2015. Disponível em: https://www.turcomat.org/index.php/turkbilmat/article/view/93. Acesso em: 1 nov. 2025.