@article{DAN_1983_269_3_a5,
     author = {E. I. Litvak},
     title = {A generalized theorem on negative cycles and estimates of the quality of flow transport in a network},
     journal = {Doklady Akademii Nauk},
     pages = {540--542},
     publisher = {mathdoc},
     volume = {269},
     number = {3},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_269_3_a5/}
}