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@article{MZM_1979_25_1_a9, author = {A. S. Shvedov}, title = {Jackson's theorem in $L^p$, $0<p<1$, for algebraic polynomials, and orders of comonotone approximations}, journal = {Matemati\v{c}eskie zametki}, pages = {107--117}, publisher = {mathdoc}, volume = {25}, number = {1}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1979_25_1_a9/} }
A. S. Shvedov. Jackson's theorem in $L^p$, $0