Babari, P., M. Pirasghari, and M.M. Zahedi. “N-Fold Positive Implicative Hyper K-Ideals”. Italian Journal of Pure and Applied Mathematics 29 (December 11, 2012): 403–418. Accessed July 18, 2026. https://journals.uniurb.it/index.php/ijpam/article/view/6023.