BookSturm—Liouville and Dirac OperatorsB. M. Levitan·I. S. Sargsjan·1991·enABIABI:AkademIndex/openalex/2026.other.210669CiteAbstractNo abstract available.IdentifiersDOI10.1007/978-94-011-3748-5Citations and referencesCited by 200 referencesMetrics — AkademScholar