TARUN KUMAR. On Vague Cosets and Vague Normal Subgroups. International Journal of Intelligent Systems and Applications in Engineering, [S. l.], v. 12, n. 2, p. 823–828, 2023. Disponível em: https://www.ijisae.org/index.php/IJISAE/article/view/7060. Acesso em: 7 dec. 2025.