1. Probability Statistics and Queueing Theory with Computer Science Applications;Allen,1978
2. The productivity of several machines under the care of one operator;Ashcroft;Journal of the Royal Statistical Society, Series B,1950
3. The productivity of machines requiring attention at random intervals;Benson;Journal of the Royal Statistical Society. Series B,1951
4. The G/M/r machine interference model;Bunday;European Journal of Operational Research,1980
5. Queues;Cox,1961