@inproceedings{Wille89a,
  address = { New~York--Budapest },
  author = {Wille, Rudolf},
  booktitle = { Data analysis, learning symbolic and numeric
      knowledge },
  editor = {Diday, E.},
  interhash = {a893a94f9e3a2ca8228e9eb47fb7eb5a},
  intrahash = {2507146ff2c51b806e5a054cddbbefaf},
  pages = { 365-380 },
  publisher = { Nova Science Publishers },
  title = { Knowledge acquisition by methods of formal
      concept analysis },
  year = { 1989 }
}