1. Abello, J. and Korn, J. (2000) Visualizing massive multi-graphs, in: Proc. of the IEEE Symposium on Information Visualization’00, October 9–13, Salt Lake City, Utah, USA, 39–47.
2. Bertin, J. (1967/83) Semiology of Graphics: Diagrams, Networks, Maps, The University of Wisconsin Press, Madison, Wisconsin, USA.
3. Boustead, I. (1995) Life cycle assessment: An overview, Energy World: The Magazin of the Institute of Energy, 230, 7–11.
4. Bretz, R. (1998) SETAC LCA workgroup: Data availability and data quality, International Journal of LCA, 3, 3, 121–123.
5. Card, S.K. and Mackinlay, J. (1997) The Structure of the Information Visualization Design Space, in: Proc. of the IEEE Symposium on Information Visualization’97, Phoenix, Arizona, USA, 92–99.