MAHMOOD, T.; EJAZ, A. On Bipolar Valued Fuzzy 𝒌-Ideals in Hemirings. The Nucleus, [S. l.], v. 52, n. 3, p. 115–122, 2015. Disponível em: http://www.thenucleuspak.org.pk/index.php/Nucleus/article/view/644. Acesso em: 14 jun. 2024.