@incollection{Wille85a,
  address = { Wien },
  author = {Wille, Rudolf},
  booktitle = { Contributions to general algebra },
  editor = {Eigenthaler, G. and Kaiser, H. K. and M{\"u}ller, W. B. and N{\"o}bauer, W.},
  interhash = {15a590236cb45daae8d14b702896b0c4},
  intrahash = {91a2ba0bd66693cde518e1dc28eb3987},
  pages = { 397-415 },
  publisher = { H{\"o}lder--Pichler--Tempsky },
  title = { Complete tolerance relations of concept
      lattices },
  volume = { 3 },
  year = { 1985 }
}