@article{BuerklinWelzel1994,
  author    = {B{\"u}rklin, Wilhelm and Welzel, Christian},
  title     = {Theoretische und methodische Grundlagen der Politikwissenschaft},
  year      = {1994},
  language  = {de}
}
@article{Welzel1994,
  author    = {Welzel, Christian},
  title     = {System changes as an outcome of the global systems competition : an evolutionary approach},
  year      = {1994},
  language  = {en}
}
@article{Welzel1995,
  author    = {Welzel, Christian},
  title     = {Politikverdrossenheit und der Wandel des Partizipationsverhaltens : zum Nutzen direkt-demokratischer Beteiligungsformen},
  year      = {1995},
  language  = {de}
}
@article{Welzel1995,
  author    = {Welzel, Christian},
  title     = {Der Umbruch des SED-Regimes im Lichte genereller Transitionsmechanismen},
  year      = {1995},
  language  = {de}
}
@article{Welzel1996,
  author    = {Welzel, Christian},
  title     = {Systemwechsel in der globalen Systemkonkurrenz : ein evolutionstheoretischer Erkl{\"a}rungsversuch},
  year      = {1996},
  language  = {de}
}
@article{BuerklinWelzel1996,
  author    = {B{\"u}rklin, Wilhelm and Welzel, Christian},
  title     = {Theoretische und methodische Grundlagen der Politikwissenschaft},
  year      = {1996},
  language  = {de}
}