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

Voir la notice de l'article provenant de la source Math-Net.Ru

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. 
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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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