@phdthesis{Stumme97b,
  author = {Stumme, Gerd},
  interhash = {eb786f9fe9fe06f968c77b33911c8908},
  intrahash = {4912decc2446fae363a6f4618f6a54ac},
  organisation = {Simon Fraser University},
  school = {TH Darmstadt},
  title = {Concept exploration: knowledge acquisition in conceptual
                 knowledge systems},
  year = 1997
}