IJ--Perfect Functions Between Bitopological Spaces. Ibn AL-Haitham Journal For Pure and Applied Sciences, [S. l.], v. 23, n. 2, p. 135–140, 2017. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/950.. Acesso em: 3 may. 2024.