Geodesic
Recovering singular differential pencils with а turning point
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 5 (2005) no. 1, pp. 71-81.

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Second-order pencils of differential equations оп the half-line with turning points are considered. We establish properties of the spectrum and study the inverse spectral problem of recovering coefficients of the pencil from the spectral data. 
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V. A. Yurko. Recovering singular differential pencils with а turning point. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 5 (2005) no. 1, pp. 71-81. http://geodesic.mathdoc.fr/item/ISU_2005_5_1_a6/

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