BABARI, P.; PIRASGHARI, M.; ZAHEDI, M.M. n-fold positive implicative hyper K-ideals. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 29, p. 403–418, 2012. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6023. Acesso em: 16 sep. 2026.