@article{ZVMMF_1962_2_1_a15,
     author = {Kh. M. Kogan},
     title = {On a variational problem of the theory of approximation},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {151--154},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1962_2_1_a15/}
}