@inproceedings{BiedermannWille96,
  address = {Heidelberg},
  author = {Biedermann, Klaus and Wille, Rudolf},
  booktitle = {From data to knowledge},
  editor = {Gaul, W. and Pfeiffer, D.},
  interhash = {240cd62a73343c8257ab2a4d3d9d6052},
  intrahash = {671bac5e68875a410e5b157315a9986f},
  pages = {141-150},
  publisher = {Springer--Verlag},
  title = {Valuations and hierarchizations},
  year = 1996
}

@inproceedings{Biedermann97b,
  address = {Berlin--Heidelberg--New York},
  author = {Biedermann, Klaus},
  booktitle = {Conceptual structures: Fulfilling Peirce's dream},
  editor = {Lukose, D. and Delugach, H. and Keeler, M. and Searle, L. and Sowa, J. F.},
  interhash = {842a769c65bb9f2c6c0433a56bf0b2ef},
  intrahash = {24fb9af131fe66186426eda2dae201a6},
  number = 1257,
  publisher = {Springer--Verlag},
  series = {LNAI},
  title = {How triadic diagrams represent conceptual structures},
  year = 1997
}

@inproceedings{Biedermann97a,
  address = {Aachen},
  author = {Biedermann, Klaus},
  booktitle = {General algebra and applications in discrete mathematics},
  editor = {Denecke, K. and L{\"u}ders, O.},
  interhash = {d4b70c32999abf763b635b2203ca5081},
  intrahash = {491dfd061877ee08c8018136df5ad66a},
  pages = {23-33},
  publisher = {Shaker Verlag},
  title = {Triadic Galois connections},
  year = 1997
}