D. D. PADMA PRIYA; G. SHOBHALATHA; R. BHUVANA VIJAYA. Fuzzyfication of Semigroups. International Journal of Mathematics And its Applications, [S. l.], v. 4, n. 2 - A, p. 79–83, 2016. Disponível em: https://ijmaa.in/index.php/ijmaa/article/view/1008. Acesso em: 3 jul. 2024.