Haji, Arsalan Shareef, and Alias Barakat Khalaf. “On Cubic Interval Vague Sets and Cubic Interval Vague Topological Spaces”. Science Journal of University of Zakho 10, no. 3 (July 1, 2022): 70–75. Accessed May 19, 2024. https://sjuoz.uoz.edu.krd/index.php/sjuoz/article/view/906.