@article{ZVMMF_2009_49_11_a11,
     author = {A. V. Kel'manov and A. V. Pyatkin},
     title = {Complexity of certain problems of searching for subsets of vectors and cluster analysis},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {2059--2065},
     publisher = {mathdoc},
     volume = {49},
     number = {11},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2009_49_11_a11/}
}