1. M.I. Afrab Begum, Analysis of the baTch arrival MX /G/1 queue with exponentially distributed Multiple working vacations, International Journal of Mathematical Sciences and Applications, 1(2), 865–880 (2011).
2. A classified bibliography of research on retrial queues: Progress in 1990–1999
3. J.R. Artalejo, V.C. Joshua, and A. Krishnamoorthy, An M/G/1 retrial queue with orbital search by server, In Advances in Stochastic Modelling, eds., New Jersey: Notable Publications, 41–54,(2002).
4. New results in the theory of repeated orders queueing systems
5. G.I. Falin, A Single-line system with secondary orders, Eng. Cybernet. Rev. 17(2), 76 (1979).