@book{WelfensJungmittagKauffmannetal.2003,
  author    = {Welfens, Paul J. J. and Jungmittag, Andre and Kauffmann, Albrecht and Schumann, Christopher},
  title     = {EU eastern enlargement and structural change : specialization patterns in accession countries and economic dynamics in the single market},
  series = {Diskussionsbeitrag / Europ{\"a}isches Institut f{\"u}r internationale Wirtschaftsbeziehungen, Potsdam},
  volume    = {106},
  journal   = {Diskussionsbeitrag / Europ{\"a}isches Institut f{\"u}r internationale Wirtschaftsbeziehungen, Potsdam},
  publisher = {Univ.},
  address   = {Potsdam},
  issn      = {1430-5445},
  pages     = {36 S.},
  year      = {2003},
  language  = {en}
}
@book{Schumann2001,
  author    = {Schumann, Christopher},
  title     = {Zum Aufbau von Humankapital : Investitionen in H{\"o}here Bildung in Estland},
  series = {International economics working paper},
  volume    = {0101},
  journal   = {International economics working paper},
  publisher = {Univ.},
  address   = {Potsdam},
  issn      = {1433-920X},
  pages     = {ca. 50 S.},
  year      = {2001},
  language  = {de}
}