@phdthesis{Witzel2014,
  author      = {Julia Witzel},
  title       = {Some aspects of the optimization over the copositive and the completely positive cone},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t Trier},
  doi       = {10.25353/ubtr-xxxx-c3c9-eb0a/},
  year        = {2014},
}