T. SHYLA ISAC MARY; A. SUBITHA. On Semi $\alpha$-Regular Pre-Semi Closed Sets in Bitopological Spaces. International Journal of Mathematics And its Applications, [S. l.], v. 4, n. 3 - B, p. 27–35, 2016. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/990. Acesso em: 3 mar. 2026.