V. J. KANERIA; H. M. MAKADIA. Graceful Labeling for Double Step Grid Graph. International Journal of Mathematics And its Applications, [S. l.], v. 3, n. 1, p. 33–38, 2015. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/400. Acesso em: 3 may. 2024.