no. 3
A queueing system with random additional service facility
RAIRO - Operations Research - Recherche Opérationnelle, Tome 12 (1978) no. 3, pp. 311-318. 
@article{RO_1978__12_3_311_0,
     author = {Bidhi Singh, K.},
     title = {A queueing system with random additional service facility},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {311--318},
     publisher = {EDP-Sciences},
     volume = {12},
     number = {3},
     year = {1978},
     mrnumber = {494565},
     zbl = {0383.60094},
     language = {en},
     url = {http://archive.numdam.org/item/RO_1978__12_3_311_0/}
}
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Bidhi Singh, K. A queueing system with random additional service facility. RAIRO - Operations Research - Recherche Opérationnelle, Tome 12 (1978) no. 3, pp. 311-318. http://archive.numdam.org/item/RO_1978__12_3_311_0/

1. J. Romani, La Teoria de las colas aplicada a un problema de production industrial, Trabajos estadistica, Vol. 6, 1955, Cuaderno ill.

2. C. R. Phillips, A Variable Channel Queueing Model with a Limited number of Channels, Thesis, Georgia Institute of Technology, 1960.

3. K. Murari, Some c-Additional Service Channels, Limited Space Queueing Problem, Z.A.M.M., Vol. 51, 1971, pp. 315-318. | MR | Zbl

4. P. M. Morse, Queues, Inventories and Maintenance, New York, Wiley, 1958. | MR