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. 
@article{MZM_2016_100_6_a2,
     author = {A. A. Vladimirov},
     title = {On the {Problem} of {Oscillation} {Properties} of {Positive} {Differential} {Operators} with {Singular} {Coefficients}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {800--806},
     publisher = {mathdoc},
     volume = {100},
     number = {6},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2016_100_6_a2/}
}
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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/