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2. On the number in the system GIX/M/∞;Holman;Sankhya,1982
3. Two Parallel Queues Created by Arrivals with Two Demands I
4. The M/G/1 retrial queue with Bernoulli schedule;Choi;QUESTA,1990
5. On the GI/M/∞ queue with batch arrivals of constant size;Brandt;QUESTA,1987