%0 Journal Article %A A. V. Pyatkin %T Ptas for problems of vector choice and clustering with different centers %J Diskretnyj analiz i issledovanie operacij %D 2023 %P 96-110 %V 30 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DA_2023_30_3_a4/ %G ru %F DA_2023_30_3_a4