1. Allen, A. O., Probability Stastic and Queueing Theory With computer Science Applications, 2nd ed., Academic press, Inc., Boston, MA, 1990.
2. Begain, K., Bolch, G., and Herold, H., Practical performance modelling application of the MOSEL Language, Wiley and Sons, New York, 2001.
3. Bunday, B.D., Basic Queueing Theory, Edward Arndd, London, 1986.
4. Analysis of a machine repair problem with an unreliable server and phase type repairs and services
5. Chaudhry, M.L., and Templeton, J.G.C., A first course in the bulk queues, John Wiley and sons, New York, 1983.