T. THANGAM; K. BAGEERATHI. Generalization of Fuzzy Boundary in Fuzzy Bitopological Spaces. International Journal of Mathematics And its Applications, [S. l.], v. 6, n. 2 - B, p. 287–294, 2018. Disponível em: https://ijmaa.in/index.php/ijmaa/article/view/727. Acesso em: 22 jul. 2024.