@article{MT_1982_1_a16,
     author = {S. G. Foss},
     title = {Systems with several types of customers},
     journal = {Matemati\v{c}eskie trudy},
     pages = {186--201},
     publisher = {mathdoc},
     volume = {1},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1982_1_a16/}
}