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@article{TM_1992_198_a11, author = {I. G. Tsar'kov}, title = {Widths and {Jackson's} type inequality for abstract functions}, journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova}, pages = {219--231}, publisher = {mathdoc}, volume = {198}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TM_1992_198_a11/} }
I. G. Tsar'kov. Widths and Jackson's type inequality for abstract functions. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Proceedings of the All-Union school on the theory of functions, Tome 198 (1992), pp. 219-231. http://geodesic.mathdoc.fr/item/TM_1992_198_a11/