14 citations · 28 across the 7 of their papers we have counts for
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math.SP2016★ 14 cited
Dirac-Krein systems on star graphs
Vadym Adamyan, Heinz Langer, Christiane Tretter +1
We study the spectrum of a self-adjoint Dirac-Krein operator with potential on a compact star graph with a finite number of edges. This operator is defined by a Di…
math.SP2016
Transfer functions and local spectral uniqueness for Sturm-Liouville operators, canonical systems and strings
Heinz Langer
It is shown that transfer functions, which play a crucial role in M.G. Krein's study of inverse spectral problems, are a proper tool to formulate local spectral uniqueness conditio…