@article{DA_2000_7_2_a9,
     author = {Yu. V. Shamardin},
     title = {On a~two-level location problem with constraints on the volume of production},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {114--118},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2000_7_2_a9/}
}