1. Asmussen, S.: Applied probability and queues, 2nd edn. Springer-Verlag, New York (2003)
2. Gelenbe, E.: Product-form queuing networks with negative and positive customers. J. App. Prob. 28(3), 656–663 (1991)
3. Gelenbe, E., Glynn, P., Sigman, K.: Queues with negative arrivals, J. App. Prob. 28, 245–250 (1991)
4. Gikhman, I.I., Skorokhod, A.V.: Introduction to the theory of random processes. Dover Publications, New York (1969)
5. Knuth, D.E.: The art of computer programming: fundamental algorithms, 3rd edn. Addison-Wesley, Berkeley (1997)