@article{FelgentreffHellerLindneretal.2000,
  author    = {Felgentreff, Carsten and Heller, Wilfried and Lindner, Waltraud and Thieme, Siegfried and Viehrig, Hans},
  title     = {Socio-Economic Transformation of East Germany},
  year      = {2000},
  language  = {en}
}
@article{HellerFelgentreffLindneretal.2001,
  author    = {Heller, Wilfried and Felgentreff, Carsten and Lindner, Waltraud and Saupe, Gabriele},
  title     = {Entrepreneurial initiative and regional development : supporting policies in the Land of Brandenburg},
  year      = {2001},
  language  = {en}
}
@misc{HellerSaupeFelgentreffetal.2006,
  author    = {Heller, Wilfried and Saupe, Gabriele and Felgentreff, Carsten and Lindner, Waltraud},
  title     = {Entrepreneurial initiative and regional development: supporting policies in the land of Brandenburg (Eastern Germany)},
  year      = {2006},
  language  = {en}
}