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@article{MZM_1987_41_2_a4, author = {A. P. Buslaev}, title = {Sharp constants and extremal functions in inequalities for derivatives}, journal = {Matemati\v{c}eskie zametki}, pages = {159--174}, publisher = {mathdoc}, volume = {41}, number = {2}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_2_a4/} }
A. P. Buslaev. Sharp constants and extremal functions in inequalities for derivatives. Matematičeskie zametki, Tome 41 (1987) no. 2, pp. 159-174. http://geodesic.mathdoc.fr/item/MZM_1987_41_2_a4/