M. Abdul-Jabbar, Abdullah. “A Generalization of A Contra Pre Semi-Open Maps”. AL-Rafidain Journal of Computer Sciences and Mathematics 3, no. 2 (December 4, 2006): 59–68. Accessed December 17, 2025. https://csmj.uomosul.edu.iq/index.php/csmj/article/view/36384.