1. Center for Environmental Structure Series;C. Alexander,1978
2. Barabási, A.-L.: The physics of the web. Physics World 14, 33–38 (2001)
3. Bederson, B.B., Schneider, B. (eds.): The craft of information visualization. Morgan Kaufmann, San Francisco (2003)
4. Lecture Notes in Computer Science,2005
5. Bruls, D., Huizing, C., van Wijk, J.: Squarified treemaps. In: de Leeuw, W., van Liere, R. (eds.) Data Visualization 2000, Proceedings of the Joint Eurographics and IEEE TCVG Symposium on Visualization, Vienna, pp. 33–42. Springer, Heidelberg (2000)