no. 2
A discrete time queueing system with departures having random memory
RAIRO. Operations research, Tome 13 (1979) no. 2, pp. 185-198 
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     author = {Gupta, U. K.},
     title = {A discrete time queueing system with departures having random memory},
     journal = {RAIRO. Operations research},
     pages = {185--198},
     year = {1979},
     publisher = {EDP-Sciences},
     volume = {13},
     number = {2},
     mrnumber = {535206},
     zbl = {0396.60093},
     language = {en},
     url = {https://www.numdam.org/item/RO_1979__13_2_185_0/}
}
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Gupta, U. K. A discrete time queueing system with departures having random memory. RAIRO. Operations research, Tome 13 (1979) no. 2, pp. 185-198. https://www.numdam.org/item/RO_1979__13_2_185_0/

1. D. R. Cox and H. D. Miller, The Theory of Stochastic Processes, London, 1970, Methuen and Co Ltd., p. 43-45. | Zbl

2. M. L. Chaudhry, Correlated Queueing, J. Canadian Operational Research Society, Vol. 3, No. 3, 1965, p. 142-151. | Zbl | MR