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@article{MZM_1991_49_5_a0, author = {N. Ainulloev}, title = {An~exact estimate of the second derivative in $l_p$}, journal = {Matemati\v{c}eskie zametki}, pages = {3--6}, publisher = {mathdoc}, volume = {49}, number = {5}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1991_49_5_a0/} }
N. Ainulloev. An~exact estimate of the second derivative in $l_p$. Matematičeskie zametki, Tome 49 (1991) no. 5, pp. 3-6. http://geodesic.mathdoc.fr/item/MZM_1991_49_5_a0/