@phdthesis{Roosen2012,
  author      = {David Roosen},
  title       = {A numerical renormalization group approach to dissipative quantum impurity systems},
  type        = {doctoralthesis},
  pages       = {225},
  school      = {Universit{\"a}tsbibliothek Johann Christian Senckenberg},
  year        = {2012},
}