@article{Heller2001,
  author    = {Heller, Wilfried},
  title     = {Socio-economic transformation in rural romania through the eyes of experts : migration and social-demographic issues},
  year      = {2001},
  language  = {en}
}
@article{Heller2001,
  author    = {Heller, Wilfried},
  title     = {Rum{\"a}nien vor den Toren der Europ{\"a}ischen Union : Migration, Landwirtschaft und l{\"a}ndlicher Raum},
  year      = {2001},
  language  = {de}
}
@article{Heller2001,
  author    = {Heller, Wilfried},
  title     = {Studies on boundaries : subjects, questions, targets},
  year      = {2001},
  language  = {en}
}
@article{Heller2001,
  author    = {Heller, Wilfried},
  title     = {Wirtschaftsr{\"a}umliche Entwicklung und Migration im post-sozialistischen Rum{\"a}nien},
  year      = {2001},
  language  = {de}
}
@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}
}
@article{HellerIanos2001,
  author    = {Heller, Wilfried and Ianos, I.},
  title     = {Wirtschaftsr{\"a}umliche Entwicklung in Rum{\"a}nien nach der Wende},
  year      = {2001},
  language  = {de}
}