F. Nirmala Irudayam, S. . (2022) “Pythagorean Vague b-Open Sets between Pythagorean Vague Topological Spaces”, Mathematical Statistician and Engineering Applications, 71(4), pp. 13071–13083. Available at: https://www.philstat.org/index.php/MSEA/article/view/2681 (Accessed: 4March2026).