Alem, Lala Maghnia, Mohamed Boualem, and Djamil Aissani. “Bounds of the Stationary Distribution in M G 1 Retrial Queue With Two-Way Communication and N Types of Outgoing Calls”. Yugoslav Journal of Operations Research 29, no. 3 (August 1, 2019): 375–391. Accessed August 25, 2025. https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/578.