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@article{MZM_1970_8_6_a9, author = {I. V. Kamenev}, title = {A criterion for the oscillation of solutions of second-order ordinary differential equations}, journal = {Matemati\v{c}eskie zametki}, pages = {773--776}, publisher = {mathdoc}, volume = {8}, number = {6}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_6_a9/} }
I. V. Kamenev. A criterion for the oscillation of solutions of second-order ordinary differential equations. Matematičeskie zametki, Tome 8 (1970) no. 6, pp. 773-776. http://geodesic.mathdoc.fr/item/MZM_1970_8_6_a9/