معمر الاخضر. Transient Solution of an M/M/1 Queue with Balking, Feedback, Catastrophe and Repair Using the Probability Generating Functio. مجلة الاقتصاد والعلوم السياسية, طرابلس، ليبيا, n. 18, 2024. Disponível em: https://journals.uot.edu.ly/index.php/jeps/article/view/1252. Acesso em: 19 2026.