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@article{DE_1986_22_6_a23, author = {A. I. Perov and A. A. Tananika}, title = {A generalization of {Wirtinger's} inequality}, journal = {Differencialʹnye uravneni\^a}, pages = {1074--1076}, publisher = {mathdoc}, volume = {22}, number = {6}, year = {1986}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1986_22_6_a23/} }
A. I. Perov; A. A. Tananika. A generalization of Wirtinger's inequality. Differencialʹnye uravneniâ, Tome 22 (1986) no. 6, pp. 1074-1076. http://geodesic.mathdoc.fr/item/DE_1986_22_6_a23/