@article{ZVMMF_2011_51_11_a13,
     author = {A. V. Kel'manov},
     title = {On the complexity of some cluster analysis problems},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {2106--2112},
     publisher = {mathdoc},
     volume = {51},
     number = {11},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2011_51_11_a13/}
}