no. V1
Conservation methods in queuing theory
Revue française d'automatique, informatique, recherche opérationnelle. Recherche opérationnelle, Tome 7 (1973) no. V1, pp. 63-83 
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     author = {Krakowski, M.},
     title = {Conservation methods in queuing theory},
     journal = {Revue fran\c{c}aise d'automatique, informatique, recherche op\'erationnelle. Recherche op\'erationnelle},
     pages = {63--83},
     year = {1973},
     publisher = {EDP Sciences},
     volume = {7},
     number = {V1},
     mrnumber = {331553},
     zbl = {0258.60069},
     language = {en},
     url = {https://www.numdam.org/item/RO_1973__7_1_63_0/}
}
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Krakowski, M. Conservation methods in queuing theory. Revue française d'automatique, informatique, recherche opérationnelle. Recherche opérationnelle, Tome 7 (1973) no. V1, pp. 63-83. https://www.numdam.org/item/RO_1973__7_1_63_0/

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[2] Feller William, An Introduction to Probability Theory and Its Applications, vol. 1, 3-rd edition, John Wiley & Sons, 1968 (or any prior edition). | Zbl | MR

[3] Krakowski Martin, Arrival and Departure Processes in Queuing Systems and the Pollaczek-Khinchin Formula, , To appear in Revue Française d'Automatique, Informatique, et Recherche Opérationnelle. | Zbl | Numdam

[4] Little John, D. C., A Proof for the Queuing Formula : L = ?W, Oper. Res., vol. 9, No 3, 383-387, 1961. | Zbl | MR

[5] Morse Philip M., Queues, Inventories and Maintenance : The Analysis of Operations Systems with Variable Demand and Supply, John Wiley & Sons, 1958. | MR

[6] Prabhu N. U., Queues and Inventories : A Study of the Basic Stochastic Processes, John Wiley & Sons, 1965. | Zbl | MR

[7] Saaty Thomas L., Elements of Queuing Theory with Applications, McGraw-Hill, 1961. | Zbl | MR