Geodesic
One-dimensional boundary value problems with operators that do not lower the number of sign alternations
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 1 
A. Yu. Levin; G. D. Stepanov. One-dimensional boundary value problems with operators that do not lower the number of sign alternations. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 1. http://geodesic.mathdoc.fr/item/RM_1975_30_1_a19/
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