Al-khafaji, Adnan. “Adnan Hashim Abdul-Wahid Al-Khaf L Proper Functions N ”. University of Thi-Qar Journal of Science 2, no. 1 (May 31, 2019): 79-87. Accessed May 2, 2026. https://jsci.utq.edu.iq/index.php/main/article/view/401.