NADA YASSEN KASM YAHYA, L.; KHALIK, A. The Lower Bounds of Eight and Fourth Blocking Sets and Existence of Minimal Blocking Sets. Journal of Education and Science (JES), [S. l.], v. 19, n. 3, p. 99–111, 2007. DOI: 10.33899/edusj.2007.51324. Disponível em: https://rjps.uomosul.edu.iq/index.php/edusj/article/view/17155. Acesso em: 4 aug. 2025.