@article{MZM_1970_7_6_a12,
     author = {N. P. Kuptsov},
     title = {Direct and inverse approximation theorems in {Banach} spaces and {Fourier} transforms},
     journal = {Matemati\v{c}eskie zametki},
     pages = {765--778},
     publisher = {mathdoc},
     volume = {7},
     number = {6},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_6_a12/}
}