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@article{DAN_1991_320_4_a3, author = {M. B. Kudaev}, title = {Nonoscillation and monotonicity of solutions of a differential}, journal = {Doklady Akademii Nauk}, pages = {789--791}, publisher = {mathdoc}, volume = {320}, number = {4}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1991_320_4_a3/} }
M. B. Kudaev. Nonoscillation and monotonicity of solutions of a differential. Doklady Akademii Nauk, Tome 320 (1991) no. 4, pp. 789-791. http://geodesic.mathdoc.fr/item/DAN_1991_320_4_a3/