@article{IM2_1970_4_3_a6,
     author = {Yu. A. Brudnyi},
     title = {Approximation of functions of~$n$ variables by quasipolynomials},
     journal = {Izvestiya. Mathematics },
     pages = {568--586},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1970_4_3_a6/}
}