S.Pazhani Bala Murugan, and R.Keerthana. “An M G 1 Feedback Retrial Queue With Working Vacation and a Waiting Server”. Journal of Computational Analysis and Applications (JoCAAA), vol. 31, no. 1, Jan. 2023, pp. 61-79, http://eudoxuspress.com/index.php/pub/article/view/66.