N.MURUGESAN, R. GRACEFUL LABELING OF SOME GRAPHS AND THEIR SUBGRAPHS. Asian Journal of Current Engineering and Maths, [S. l.], v. 1, n. 6, 2013. Disponível em: http://innovativejournal.in/index.php/ajcem/article/view/129. Acesso em: 2 may. 2024.