Geodesic
The integral comparison of two second order linear differential equations
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 3 
I. V. Kamenev. The integral comparison of two second order linear differential equations. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 27 (1972) no. 3. http://geodesic.mathdoc.fr/item/RM_1972_27_3_a12/
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     title = {The integral comparison of two second order linear differential equations},
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[6] A. Wintner, “On the non-existence of conjugate points”, Amer. J. Math., 73:2 (1951) | DOI | MR

[7] I. V. Kamenev, “Metod integralnogo sravneniya v teorii obyknovennykh differentsialnykh uravnenii vtorogo poryadka”, Trudy MIEM, 1971, no. 24