1. Metadata Standards, ISO/IEC JTC1 SC32 WG2,
http://metadata-stds.org/
2. Berners-Lee, T., Hendler, J., Lassila, O.: The Semantic Web. Scientific American 284 (2001)
3. Corbett, D.: Reasoning and Unification over Conceptual Graphs. Kluwer Academic, New York (2003)
4. Delugach, H.: CharGer: Some Lessons Learned and New Directions. In: Stumme, G. (ed.) Working with Conceptual Structures: Contributions to ICCS 2000, pp. 306–309. Shaker Verlag, Germany (2000)
5. CharGer - A Conceptual Graph Editor, Univ. of Alabama in Huntsville,
http://www.cs.uah.edu/~delugach/CharGer