@article{DA_2012_19_6_a1,
     author = {E. Kh. Gimadi and A. A. Kurochkin},
     title = {Effective algorithm for solving a~two-level facility location problem on a~tree-like network},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {9--22},
     publisher = {mathdoc},
     volume = {19},
     number = {6},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2012_19_6_a1/}
}