KANERIA, V. J. .; MAKADIA, H. M. Graceful Labeling for Plus Graph. International Journal of Current Research in Science and Technology, [S. l.], v. 1, n. 03, 2015. Disponível em: https://ijcrst.in/index.php/ijcrst/article/view/78. Acesso em: 18 may. 2024.