Mahmood, Sabiha I . “On A Bitopological (1,2)*- Proper Functions”. Ibn AL-Haitham Journal For Pure and Applied Sciences 26, no. 2 (April 27, 2017): 358–373. Accessed June 22, 2026. https://www.jih.uobaghdad.edu.iq/index.php/j/article/view/483.