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@article{DE_1965_1_5_a5, author = {V. V. Ostroumov}, title = {On a differential inequality for a boundary value problem}, journal = {Differencialʹnye uravneni\^a}, pages = {625--630}, publisher = {mathdoc}, volume = {1}, number = {5}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1965_1_5_a5/} }
V. V. Ostroumov. On a differential inequality for a boundary value problem. Differencialʹnye uravneniâ, Tome 1 (1965) no. 5, pp. 625-630. http://geodesic.mathdoc.fr/item/DE_1965_1_5_a5/