J, Makbola. “Existence Of (18,9;F)-Arc Of Type (4,9) In PG(2,5)”. Journal of Education and Science 19, no. 3 (April 1, 2007): 87–98. Accessed September 10, 2025. https://edusj.uomosul.edu.iq/index.php/edusj/article/view/41300.