no. 3
A generalization of the Erlang's B formula
RAIRO. Operations research, Tome 23 (1989) no. 3, pp. 283-288 
@article{RO_1989__23_3_283_0,
     author = {Lambros, A. and Pombortsis, A. and Sideridis, A. and Tambouratzis, D.},
     title = {A generalization of the {Erlang's} {B} formula},
     journal = {RAIRO. Operations research},
     pages = {283--288},
     year = {1989},
     publisher = {EDP-Sciences},
     volume = {23},
     number = {3},
     mrnumber = {1025080},
     zbl = {0678.90036},
     language = {en},
     url = {https://www.numdam.org/item/RO_1989__23_3_283_0/}
}
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Lambros, A.; Pombortsis, A.; Sideridis, A.; Tambouratzis, D. A generalization of the Erlang's B formula. RAIRO. Operations research, Tome 23 (1989) no. 3, pp. 283-288. https://www.numdam.org/item/RO_1989__23_3_283_0/

1. A. P. Lambros, L. Gabrielidis and H. Polatoglou, Erlang and Normal Distributions in Telex Traffic, I.E.E.E. Transactions on Communications, 29, n° 7, 1036, 1981.

2. L. Kleinrock, Queueing Systems Theory, I, J. Wiley 1975. | Zbl