Geodesic
An Irregular Extension of the Oscillation Theory of the Sturm--Liouville Spectral Problem
Matematičeskie zametki, Tome 82 (2007) no. 4, pp. 578-582

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Oscillation spectral properties (such as the number of zeros, the alternation of zeros for eigenfunctions, the simplicity of the spectrum, etc.) for the Sturm–Liouville problem with generalized coefficients are described.
Mots-clés : Sturm–Liouville problem
Keywords: oscillation spectral properties, number of zeros, alternation of zeros, Stieltjes differential, differential inequality. 
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     title = {An {Irregular} {Extension} of the {Oscillation} {Theory} of the {Sturm--Liouville} {Spectral} {Problem}},
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Yu. V. Pokornyi; M. B. Zvereva; A. S. Ishchenko; S. A. Shabrov. An Irregular Extension of the Oscillation Theory of the Sturm--Liouville Spectral Problem. Matematičeskie zametki, Tome 82 (2007) no. 4, pp. 578-582. http://geodesic.mathdoc.fr/item/MZM_2007_82_4_a11/