Markovian Erlang Non-Constricted Single-Channel with Encouraged Arrival in Steady State with Balking, Feedback Strategy, and Customer Retention. Contemp. Math. [Internet]. 2023 Oct. 25 [cited 2025 Dec. 24];4(4):769-81. Available from: https://ojs353.mebyme.cn/index.php/CM/article/view/2964