MULLO CÓNDOR , Kevin Santiago. Teaching Mathematics through Variation Theory: A Systematic Review of Empirical Evidence . MENTOR revista de investigación educativa y deportiva , [S. l.], v. 5, n. 15, p. 01–10, 2026. DOI: 10.56200/mentor.v5i15.13613. Disponível em: https://revistamentor.ec/index.php/mentor/article/view/13613. Acesso em: 16 sep. 2026.