@phdthesis{Kracker91,
  author	= {Kracker, M.},
  month		= apr,
  year		= {1991},
  title		= {Unscharfes assoziatives Begriffswissen zur Unterst{\"u}tzung der Formulierung von Datenbankabfragen},
  note		= {(Title in English: Fuzzy Associative Conceptual Knowledge for Supporting Query Formulation)},
  school	= {TU Wien}
}