@article{ZVMMF_1978_18_5_a24,
     author = {V. V. Pospelov},
     title = {The error of approximation of a function of two variables by sums of the products of functions of one variable},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1307--1308},
     publisher = {mathdoc},
     volume = {18},
     number = {5},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1978_18_5_a24/}
}