@proceedings{delugach01conceptual,,
  title = {Conceptual Structures -- Broadening the Base. Proc. 9th International Conference on Conceptual Structures},
  publisher = {Springer},
  year = {2001},
  volume = {2120}
}

@inproceedings{eklund00contextual,
  author = {Eklund, P. and Groh, B. and Stumme, G. and Wille, R.},
  title = {Contextual-Logic Extension of TOSCANA.},
  booktitle = {Conceptual Structures: Logical, Linguistic, and Computational},
  publisher = {Springer},
  year = {2000},
  volume = {1867},
  pages = {453-467},
  url = {http://www.kde.cs.uni-kassel.de/stumme/papers/2000/ICCS_toscanaextension.pdf}
}

@proceedings{stumme00working,,
  title = {Working with Conceptual Structures -- Contributions to ICCS 2000. Suppl. Proc. 8th International

                Conference on Conceptual Structures (ICCS 2000)},
  publisher = {Shaker},
  year = {2000}
}

@inproceedings{mineau99conceptual,
  author = {Mineau, Guy and Stumme, Gerd and Wille, Rudolf},
  title = {Conceptual Structures  Represented by Conceptual Graphs and Formal Concept Analysis},
  booktitle = {Conceptual Structures: Standards  and  Practices. Proc. ICCS '99},
  publisher = {Springer},
  year = {1999},
  volume = {1640},
  pages = {423-441},
  url = {http://www.kde.cs.uni-kassel.de/stumme/papers/1999/ICCS99.pdf}
}

@book{sowa84,
  author = {Sowa, J. F.},
  title = {Conceptual Structures: Information Processing in Mind and Machine},
  publisher = {Addison-Wesley Publishing Company},
  year = {1984}
}