LU, S.; LIU, Y.; FU, Z.; CHENG, L. A Note on Hesitant Fuzzy Approximation Spaces and Hesitant Fuzzy Topological Spaces. Contemporary Mathematics , [S. l.], v. 7, n. 4, p. 4576–4590, 2026. DOI: 10.37256/cm.7420269785. Disponível em: https://ojs.wiserpub.com/index.php/CM/article/view/9785. Acesso em: 13 aug. 2026.