eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences March 2020 32 3 16 20 http://dx.doi.org/10.22147/jusps-B/320301 1516 article SANDEEP DIXIT 1 Associate Professor Department of Mathematics, V.S.S.D. College, Kanpur UP India <p>In this section we consider a Quasi-Birth-and-Death Process. A QBD process is the generalization of a birth-and-death process from a one-dimensional state space to a multidimensional state space. It can be analyzed by using the matrix analytical method (Neuts, 1981 and Latouche, 2011)</p> https://ultraphysicalsciences.org/paper/1516/ : Multiserver infinitesimal generator positive recurrent