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Spectral properties of second-order singularly perturbed boundary value problems with turning points. (English) Zbl 0345.34045


MSC:

34E20 Singular perturbations, turning point theory, WKB methods for ordinary differential equations
34L99 Ordinary differential operators
47A55 Perturbation theory of linear operators
Full Text: DOI

References:

[1] Ackerberg, R. C.; O’Malley, R. E., Boundary layer problems exhibiting resonance, Stud. Appl. Math., 49, 277-295 (1970) · Zbl 0198.12901
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[11] de Groen, P. P.N., Singularly Perturbed Differential Operators of Second Order, (Mathematical Centre Tract 68 (1976), Mathematisch Centrum: Mathematisch Centrum Amsterdam) · Zbl 0387.34042
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