@article{DA_2008_15_4_a6,
     author = {V. V. Shenmaier},
     title = {An approximation algorithm for the hierarchical median problem},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {84--91},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2008_15_4_a6/}
}