Mahmood, Sabiha I. “Weak Forms of Fuzzy N- Open Sets and Fuzzy - Sets in Fuzzy Topological Spaces”. Iraqi Journal of Science 58, no. 4C (January 8, 2018): 2401–2411. Accessed June 3, 2026. https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/109.