no. 1
Distribution of crossings of level K in a busy cycle of the M/G/1 queue
Annales de l'institut Henri Poincaré. Section B. Calcul des probabilités et statistiques, Tome 4 (1968) no. 1, pp. 75-81 
@article{AIHPB_1968__4_1_75_0,
     author = {Cohen, J. W. and Greenberg, I.},
     title = {Distribution of crossings of level $K$ in a busy cycle of the {M/G/1} queue},
     journal = {Annales de l'institut Henri Poincar\'e. Section B. Calcul des probabilit\'es et statistiques},
     pages = {75--81},
     year = {1968},
     publisher = {Gauthier-Villars},
     volume = {4},
     number = {1},
     mrnumber = {232465},
     zbl = {0162.49401},
     language = {en},
     url = {https://www.numdam.org/item/AIHPB_1968__4_1_75_0/}
}
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Cohen, J. W.; Greenberg, I. Distribution of crossings of level $K$ in a busy cycle of the M/G/1 queue. Annales de l'institut Henri Poincaré. Section B. Calcul des probabilités et statistiques, Tome 4 (1968) no. 1, pp. 75-81. https://www.numdam.org/item/AIHPB_1968__4_1_75_0/

[1] Takacs, L., Introduction to the theory of queues. Oxford University Press, New York, 1962. | Zbl | MR

[2] Cohen, J.W., Single server queue with uniformly bounded virtual delay time, to be published in Journ. Appl. Prob. | Zbl

[3] Takacs, L., Application of ballot theorems in the theory of queues. Proc. Symp. on Congestion Theory, The University of North Carolina Press, Chapel Hill, 1965. | Zbl | MR