@phdthesis{Wagner2013,
  author      = {Matthias Wagner},
  title       = {Numerical Optimization in Survey Statistics},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t Trier},
  doi       = {10.25353/ubtr-xxxx-28de-e379/},
  year        = {2013},
}