Geodesic
Direct and inverse approximation theorems in Banach spaces and Fourier transforms
Matematičeskie zametki, Tome 7 (1970) no. 6, pp. 765-778 
N. P. Kuptsov. Direct and inverse approximation theorems in Banach spaces and Fourier transforms. Matematičeskie zametki, Tome 7 (1970) no. 6, pp. 765-778. http://geodesic.mathdoc.fr/item/MZM_1970_7_6_a12/
@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},
     year = {1970},
     volume = {7},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_6_a12/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

An author's summary of a thesis submitted for the degree of Doctor of Physico-Mathematical Sciences. The dissertation was defended December 19, 1969, at a session of the scientific council of the Mechanical-Mathematics Faculty of the M. V. Lomonosov Moscow State University. The official opponents were Professors V. K. Dzyadyk, B. M. Levitan, and S. B. Stechkin, all Doctors of physico-mathematical sciences.