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@article{DAN_1979_248_5_a2, author = {A. P. Buslaev}, title = {On best approximation of the differentiation operator}, journal = {Doklady Akademii Nauk}, pages = {1041--1044}, publisher = {mathdoc}, volume = {248}, number = {5}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1979_248_5_a2/} }
A. P. Buslaev. On best approximation of the differentiation operator. Doklady Akademii Nauk, Tome 248 (1979) no. 5, pp. 1041-1044. http://geodesic.mathdoc.fr/item/DAN_1979_248_5_a2/