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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     title = {Conservation methods in queuing theory},
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     pages = {63--83},
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     volume = {7},
     number = {V1},
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     mrnumber = {331553},
     zbl = {0258.60069},
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     url = {http://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. http://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). | MR | Zbl

[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. | Numdam | Zbl

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

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