@article{WelfensHartwig1998,
  author    = {Welfens, Paul J. J. and Hartwig, Karl-Hans},
  title     = {EU und Osteuropa},
  year      = {1998},
  language  = {de}
}
@article{WelfensHartwig1997,
  author    = {Welfens, Paul J. J. and Hartwig, Karl-Hans},
  title     = {Eu-Osteuropa},
  year      = {1997},
  language  = {de}
}