ELHAMAYEL, M. A.; SALLEH, Z. On (i,j) supra R-open sets and their applications on supra bitopological spaces. Journal of Mathematical Sciences and Informatics, [S. l.], v. 3, n. 1, 2023. Disponível em: https://journal.umt.edu.my/index.php/jmsi/article/view/372. Acesso em: 13 sep. 2026.