SHAH, M.; AHMAD, I. Paramedial and Bol* Abel-Grassmann Groupoids. The Nucleus, [S. l.], v. 52, n. 3, p. 130–137, 2015. Disponível em: http://www.thenucleuspak.org.pk/index.php/Nucleus/article/view/646. Acesso em: 8 may. 2024.