Geodesic
Nonoscillation criteria for solutions of a second-order linear differential equation
Matematičeskie zametki, Tome 18 (1975) no. 1, pp. 51-56.

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A general method is proposed for constructing necessary and sufficient conditions for the nonoscillation of a second-order linear equation. 
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     author = {I. V. Kamenev},
     title = {Nonoscillation criteria for solutions of a second-order linear differential equation},
     journal = {Matemati\v{c}eskie zametki},
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     publisher = {mathdoc},
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     year = {1975},
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     url = {http://geodesic.mathdoc.fr/item/MZM_1975_18_1_a6/}
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I. V. Kamenev. Nonoscillation criteria for solutions of a second-order linear differential equation. Matematičeskie zametki, Tome 18 (1975) no. 1, pp. 51-56. http://geodesic.mathdoc.fr/item/MZM_1975_18_1_a6/