SANGODAPO, T. O.; ONASANYA, B. O. BIPOLAR PICTURE FUZZY SUBGROUP OF A GROUP: BIPOLAR PICTURE FUZZY SUBGROUP. Journal of the Nigerian Mathematical Society, [S. l.], v. 42, n. 2, p. 111–139, 2023. Disponível em: https://ojs.ictp.it/jnms/index.php/jnms/article/view/948. Acesso em: 10 may. 2024.