@inbook{3282887e2984471a9c05aa4def1ba989,
title = "Elliptic operators, Dirichlet-to-Neumann maps and quasi boundary triples",
abstract = "The notion of quasi boundary triples and their Weyl functions is reviewed and applied to self-adjointness and spectral problems for a class of elliptic, formally symmetric, second order partial differential expressions with variable coefficients on bounded domains.",
keywords = "extension theory, Dirichlet-to-Neumann maps, symmetric operators, quasi boundary triple",
author = "Jussi Behrndt and Matthias Langer",
year = "2012",
month = oct,
language = "English",
isbn = "9781107606111",
series = "London Mathematial Society Lecture Note Series",
publisher = "Cambridge University Press",
pages = "121--160",
editor = "Seppo Hassi and {de Snoo}, {Hendrik S. V.} and Szafraniec, {Franciszek Hugon}",
booktitle = "Operator Methods for Boundary Value Problems",
address = "United Kingdom",
}