J, M. Existence Of (18,9;f)-Arc Of Type (4,9) In PG(2,5). Journal of Education and Science (JES), [S. l.], v. 19, n. 3, p. 87–98, 2007. DOI: 10.33899/edusj.2007.51323. Disponível em: https://ojs.uomosul.edu.iq/index.php/edusj/article/view/23168. Acesso em: 6 aug. 2025.