Vijaya Laxmi, P, Hasan A Qrewi, and Andwilile A George. “Analysis of Batch Arrival General Service Queue With Balking, Feedback and Second Optional Service”. Contemporary Mathematics 4, no. 4 (November 15, 2023): 1109–1124. Accessed July 3, 2024. https://ojs.wiserpub.com/index.php/CM/article/view/2688.