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@article{IVM_1980_4_a9, author = {A. A. Ligun}, title = {Best approximation of differentiable functions by algebraic polynomials}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {53--60}, publisher = {mathdoc}, number = {4}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1980_4_a9/} }
A. A. Ligun. Best approximation of differentiable functions by algebraic polynomials. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1980), pp. 53-60. http://geodesic.mathdoc.fr/item/IVM_1980_4_a9/