G. SUBASHINI; K. RAMANATHAN; K. MANIMEKALAI. Square Sum Labeling for Pyramid Graph and Hanging Pyramid Graph. International Journal of Mathematics And its Applications, [S. l.], v. 6, n. 1 (Special Issue), p. 97–102, 2018. Disponível em: https://ijmaa.in/index.php/ijmaa/article/view/1401. Acesso em: 22 jul. 2024.