@article{ZNSL_1984_139_a1,
     author = {K. V. Shakhbazyan and T. A. Tushkina},
     title = {Maximum number of flows in a pipeline},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {22--40},
     year = {1984},
     volume = {139},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_139_a1/}
}