Geodesic
Spectral Asymptotics for the Sturm--Liouville Operator with Point Interaction
Funkcionalʹnyj analiz i ego priloženiâ, Tome 44 (2010) no. 4, pp. 14-20

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For the Sturm–Liouville operator with point interaction, weak asymptotics of the discrete spectrum are found. A class of operators for which zero is the unique spectrum accumulation point is specified.
Keywords: point interaction, spectrum, asymptotics, alternating sequences. 
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     author = {R. S. Ismagilov and A. G. Kostyuchenko},
     title = {Spectral {Asymptotics} for the {Sturm--Liouville} {Operator} with {Point} {Interaction}},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
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R. S. Ismagilov; A. G. Kostyuchenko. Spectral Asymptotics for the Sturm--Liouville Operator with Point Interaction. Funkcionalʹnyj analiz i ego priloženiâ, Tome 44 (2010) no. 4, pp. 14-20. http://geodesic.mathdoc.fr/item/FAA_2010_44_4_a1/