Markovian Erlang Non-Constricted Single-Channel with Encouraged Arrival in Steady State with Balking, Feedback Strategy, and Customer Retention. Contemporary Mathematics , [S. l.], v. 4, n. 4, p. 769–781, 2023. DOI: 10.37256/cm.4420232964. Disponível em: https://ojs353.mebyme.cn/index.php/CM/article/view/2964. Acesso em: 24 dec. 2025.