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@article{MZM_1987_41_6_a4, author = {F. V. Guseinov}, title = {Jensen's inequality}, journal = {Matemati\v{c}eskie zametki}, pages = {798--806}, publisher = {mathdoc}, volume = {41}, number = {6}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_6_a4/} }
F. V. Guseinov. Jensen's inequality. Matematičeskie zametki, Tome 41 (1987) no. 6, pp. 798-806. http://geodesic.mathdoc.fr/item/MZM_1987_41_6_a4/