@phdthesis{Ewen2018,
  author      = {Martin Ewen},
  title       = {On the stability of portfolio risk - An analysis of the impact of portfolio size and risk based fund classification},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t Trier},
  doi       = {10.25353/ubtr-xxxx-27f8-9d9b},
  year        = {2018},
}