GONZÁLEZ, A.; GAVILÁN-IZQUIERDO, J. M.; GALLEGO-SÁNCHEZ, I.; PUERTAS, M. L. A theoretical analysis of the validity of the Van Hiele levels of reasoning in graph theory. Journal on Mathematics Education, [S. l.], v. 13, n. 3, p. 515–530, 2022. DOI: 10.22342/jme.v13i3.pp515-530. Disponível em: http://jme.ejournal.unsri.ac.id/index.php/jme/article/view/16. Acesso em: 20 may. 2024.