S.Shanmugasundaram, and C.Baby. “Steady State Analysis Of (M M 1):(Fcfs K ∞) Queueing Network With Feedback Retrial And Blocking”. Journal of Computational Analysis and Applications (JoCAAA), vol. 33, no. 05, Sept. 2024, pp. 485-91, http://eudoxuspress.com/index.php/pub/article/view/562.