Efficient Zero Ring Labeling of Graphs. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 13, n. 3, p. 674–696, 2020. DOI: 10.29020/nybg.ejpam.v13i3.3780. Disponível em: https://ejpam.com/index.php/ejpam/article/view/3780.. Acesso em: 4 may. 2024.