Certain Characterization of m-Polar Fuzzy Graphs by Level Graphs. Punjab University Journal of Mathematics, [S. l.], v. 48, n. 1, p. 1–12, 2017. Disponível em: https://pujm.pu.edu.pk/index.php/pujm/article/view/78. Acesso em: 29 jun. 2025.