Geodesic
On the Problem of Oscillation Properties of Positive Differential Operators with Singular Coefficients
Matematičeskie zametki, Tome 100 (2016) no. 6, pp. 800-806

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A criterion for a highly singular positive fourth-order operator with separable boundary conditions to have oscillation properties, as well as sufficient conditions for similar higher-order operators to have oscillation properties, are obtained.
Keywords: positive self-adjoint ordinary differential operator, Sobolev space, oscillation of eigenfunctions. 
A. A. Vladimirov. On the Problem of Oscillation Properties of Positive Differential Operators with Singular Coefficients. Matematičeskie zametki, Tome 100 (2016) no. 6, pp. 800-806. http://geodesic.mathdoc.fr/item/MZM_2016_100_6_a2/
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