@phdthesis{Kempf2007,
  author      = {Stefan Kempf},
  title       = {Das Optionswertmodell zur Erkl{\"a}rung der Rentenentscheidung},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year        = {2007},
}