Kumar S, Indra. Analysis of Two-Dimensional State Markovian Queuing Model with Multiple Vacation, Correlated Servers, Feedback and Catastrophes. Pak.j.stat.oper.res. [Internet]. 2025Mar.7 [cited 2025Jul.31];21(1):1-13. Available from: https://pjsor.com/pjsor/article/view/4703