@phdthesis{Knape2013,
  author      = {Margarete Knape},
  title       = {P{\´o}lya urns via the contraction method},
  type        = {doctoralthesis},
  pages       = {84},
  school      = {Universit{\"a}tsbibliothek Johann Christian Senckenberg},
  year        = {2013},
}