no. 2
Queues with infinitely many servers
RAIRO - Operations Research - Recherche Opérationnelle, Tome 14 (1980) no. 2, pp. 109-113. 
@article{RO_1980__14_2_109_0,
     author = {Tak\'acs, Lajos},
     title = {Queues with infinitely many servers},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {109--113},
     publisher = {EDP-Sciences},
     volume = {14},
     number = {2},
     year = {1980},
     mrnumber = {575658},
     zbl = {0428.60095},
     language = {en},
     url = {http://www.numdam.org/item/RO_1980__14_2_109_0/}
}
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Takács, Lajos. Queues with infinitely many servers. RAIRO - Operations Research - Recherche Opérationnelle, Tome 14 (1980) no. 2, pp. 109-113. http://www.numdam.org/item/RO_1980__14_2_109_0/

1. L. Takács, On a Coincidence Problem Concerning Telephone Traffic, Acta Mathematica Acad. Sc. Hungaricae, Vol. 9, 1958, pp. 45-81. | MR | Zbl

2. L. Takács, A Moment Problem, Journal of the Australian Mathematical Society, Vol. 5, 1965, pp. 487-490.pp. | MR | Zbl