PATRA, K.; BEGUM, S. On the Structure of Nil Graph of a Commutative Ring. MATEMATIKA: Malaysian Journal of Industrial and Applied Mathematics, [S. l.], v. 31, n. 1, p. 37–45, 2015. DOI: 10.11113/matematika.v31.n1.629. Disponível em: https://matematika.utm.my/index.php/matematika/article/view/629. Acesso em: 28 sep. 2021.