IMMACULATE, H. Jude; JAFARI, Saeid; AROCKIARANI, I. Intuitionistic fuzzy ideals on approximation systems. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 43, p. 224–236, 2020. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/7352. Acesso em: 6 nov. 2026.