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@article{MZM_1981_29_5_a6, author = {A. P. Buslaev}, title = {Approximation of a differentiation operator}, journal = {Matemati\v{c}eskie zametki}, pages = {731--742}, publisher = {mathdoc}, volume = {29}, number = {5}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1981_29_5_a6/} }
A. P. Buslaev. Approximation of a differentiation operator. Matematičeskie zametki, Tome 29 (1981) no. 5, pp. 731-742. http://geodesic.mathdoc.fr/item/MZM_1981_29_5_a6/