Unitary Equivalence of Proper Extensions of a Symmetric Operator and the Weyl Function

Generalized resolvents and the boundary value problems for Hermitian operators with gaps

Volodymyr Derkach, M. M. Malamud · Journal of Functional Analysis · 1991 · 532 citations

Linear Operator, Resolvent Kernel, Boundary Value Problems +4

Sturm–liouville and dirac operators

Mathematics and Computers in Simulation · 1992 · 401 citations

Spectral Theory, Engineering, Potential Theory +3

The extension theory of Hermitian operators and the moment problem

Volodymyr Derkach, M. M. Malamud · Journal of Mathematical Sciences · 1995 · 337 citations

Spectral Theory, Linear Operator, Engineering +4

On generalized resolvents and<i>Q</i>-functions of symmetric linear relations (subspaces) in Hilbert space

Heinz Langer, Björn Textorius · Pacific Journal of Mathematics · 1977 · 191 citations · Full text

Spectral Theory, Symmetric Function, Linear Operator +11

<i>M</i> ‐functions for closed extensions of adjoint pairs of operators with applications to elliptic boundary problems

B. M. Brown, Gerd Grubb, Ian Wood · Mathematische Nachrichten · 2009 · 91 citations

Spectral Theory, Elliptic Boundary Problems, Elliptic Equation +10