P. L. VIHOL; P. H. SHAH. Difference Cordial Labeling of 2-tuple Graphs of Some Graphs. International Journal of Mathematics And its Applications, [S. l.], v. 4, n. 2 - A, p. 111–119, 2016. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/1013. Acesso em: 17 may. 2024.