@book{wille94begriffliche,
  address = {Mannheim},
  editor = {Wille, R. and Zickwolff, M.},
  interhash = {11b9b79ae74a437be674863ce34c7d99},
  intrahash = {b35491547f2fa7000eb3f518b0e3a336},
  publisher = {B.I.-Wissenschaftsverlag},
  title = {Begriffliche Wissensverarbeitung -- Grundfragen und Aufgaben},
  year = 1994
}

@article{wille00begriffliche,
  author = {Wille, Rudolf},
  date = {2002-01-03},
  ee = {http://link.springer.de/link/service/journals/00287/bibs/0023006/00230357.htm},
  interhash = {ba6eb23831c56cc991e1b35f7ff4ef89},
  intrahash = {575062d98fb3c6d0a65c976d6c23d933},
  journal = {Informatik Spektrum},
  number = 6,
  pages = {357-369},
  title = {Begriffliche Wissensverarbeitung: Theorie und Praxis},
  url = {http://dblp.uni-trier.de/db/journals/insk/insk23.html#Wille00},
  volume = 23,
  year = 2000
}

@article{wille00begriffliche,
  author = {Wille, Rudolf},
  date = {2002-01-03},
  ee = {http://link.springer.de/link/service/journals/00287/bibs/0023006/00230357.htm},
  interhash = {ba6eb23831c56cc991e1b35f7ff4ef89},
  intrahash = {8b3d9e55b5756262ef65758345258d3b},
  journal = {Informatik--Spektrum},
  number = 6,
  pages = {357-369},
  title = {{Begriffliche Wissensverarbeitung: Theorie und Praxis}},
  url = {http://dblp.uni-trier.de/db/journals/insk/insk23.html#Wille00},
  volume = 23,
  year = 2000
}