Banyan Ibrahim Al-Salim A, أمانی. minimal blocking set of size (30) in PG (2,19) plane. EDUSJ [Internet]. 2012 Sep. 1 [cited 2025 Aug. 4];25(3):191-205. Available from: https://rjps.uomosul.edu.iq/index.php/edusj/article/view/17989