F. NIRMALA IRUDAYAM, S. . Pythagorean Vague b-Open Sets between Pythagorean Vague Topological Spaces. Mathematical Statistician and Engineering Applications, [S. l.], v. 71, n. 4, p. 13071–13083, 2022. Disponível em: https://www.philstat.org/index.php/MSEA/article/view/2681. Acesso em: 4 mar. 2026.