S. K. VAIDYA; N. H. SHAH. Cordial Labeling of Snakes. International Journal of Mathematics And its Applications, [S. l.], v. 2, n. 3, p. 17–27, 2014. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/308. Acesso em: 25 apr. 2024.