@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'I.H.P. Probabilit\'es et statistiques},
     pages = {75--81},
     year = {1968},
     publisher = {Gauthier-Villars},
     volume = {4},
     number = {1},
     mrnumber = {232465},
     zbl = {0162.49401},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AIHPB_1968__4_1_75_0/}
}