V. BALAJI; D. S. T. RAMESH; M. ELAKKIYA. On Relaxed Skolem Mean Labling For Four Star. International Journal of Mathematics And its Applications, [S. l.], v. 4, n. 1 - C, p. 17–22, 2016. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/588. Acesso em: 17 may. 2024.