Elkhlout, Heyam, Yousef Algadid, and Waleed Hannun. “On H-Property in Bitopological Spaces”. Journal of Humanitarian and Applied Sciences 7, no. 13 (November 25, 2023): 403–408. Accessed July 3, 2024. https://khsj.elmergib.edu.ly/index.php/jhas/article/view/246.