J, M. Existence Of (18,9;f)-Arc Of Type (4,9) In PG(2,5). Journal of Education and Science, [S. l.], v. 19, n. 3, p. 87–98, 2007. DOI: 10.33899/edusj.2007.51323. Disponível em: https://edusj.uomosul.edu.iq/index.php/edusj/article/view/41300. Acesso em: 10 sep. 2025.