@misc{Wagner2005,
  author    = {Wagner, Dieter},
  title     = {Teammanagement},
  year      = {2005},
  language  = {de}
}
@misc{Wagner2000,
  author    = {Wagner, Dieter},
  title     = {Etzioni, Amitai},
  isbn      = {3-531-22186-8},
  year      = {2000},
  language  = {de}
}