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Spectral properties of Sturm-Liouville equations with singular energy-dependent potentials
MFAT 19 (2013), no. 4, 327-345
We study spectral properties of energy-dependent Sturm--Liouville equations, introduce the notion of norming constants and establish their interrelation with the spectra. One of the main tools is the linearization of the problem in a suitable Pontryagin space.