@phdthesis{Becker2004,
  author      = {Ralf Becker},
  title       = {Mobilit{\"a}t und Werte},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t Trier},
  doi       = {10.25353/ubtr-xxxx-0c8e-a558},
  year        = {2004},
}