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@article{DAN_1993_331_6_a8, author = {K. V. Runovskii}, title = {Direct and inverse theorems of approximation theory in the spaces $L_p$, $0<p<1$}, journal = {Doklady Akademii Nauk}, pages = {684--686}, publisher = {mathdoc}, volume = {331}, number = {6}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1993_331_6_a8/} }
K. V. Runovskii. Direct and inverse theorems of approximation theory in the spaces $L_p$, $0