Khan, Ismailkhan Enayathulla, and Rajendran Paramasivam. “Markovian Erlang Non-Constricted Single-Channel With Encouraged Arrival in Steady State With Balking, Feedback Strategy, and Customer Retention”. Contemporary Mathematics 4, no. 4 (October 25, 2023): 769–781. Accessed July 3, 2024. https://ojs.wiserpub.com/index.php/CM/article/view/2964.