K. Fairchild, S. Poltrock, and G. Furnas. R. Guidon (ed): Cognitive Science and Its Applications for Human-Computer
Interaction., Lawrence Erlbaum Associates, Reprint in Card, S.K., et al. (Eds.) Information Visualization: Using
Vision to Think. Morgan Kaufmann Publishers, Inc., 1999..(1999)
U. Brandes, and S. Corman. INFOVIS '02: Proceedings of the IEEE Symposium on Information Visualization
(InfoVis'02), page 145. IEEE Computer Society, (2002)