1. A. A. Borovkov, Stochastic Processes in Queueing Theory, Springer, Berlin-Heidelberg-New York-Tokyo (1976).
2. A. A. Borovkov, ?Ergodic and stability theorems for a class of stochastic equations and their applications,? Teor. Veroyatn. Primen.,23, No. 2, 241?262 (1978).
3. A. A. Borovkov, Asymptotic Methods in Queuing Theory, Wiley, New York (1984).
4. I. Akhmarov and N. P. Leont'eva, ?Conditions for convergence to limit processes, and the strong law of large numbers for queueing systems,? Teor. Veroyatn. Primen.,21, No. 3, 559?570 (1976).
5. I. Akhmarov, ?On the rate of convergence in ergodicity and continuity theorems for multichannel queueing systems,? Teor. Veroyatnost. Primen.,24, No. 2, 418?424 (1979).