HOGUE, . D.; SPENGLER, .; HUGHES, .; BELL, . Building a Foundational Understanding of Systems of Equations. Ohio Journal of School Mathematics, [S. l.], v. 94, n. 1, p. 21–30, 2023. Disponível em: http://voyager.janeway.systems:9999/index.php/OJSM/article/view/9482. Acesso em: 7 nov. 2026.