I. Cadez, D. Heckerman, C. Meek, P. Smyth, und S. White. Proceedings of the Sixth ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, Seite 280--284. New York, NY, USA, ACM, (2000)
S. Havre, B. Hetzler, und L. Nowell. INFOVIS '00: Proceedings of the IEEE Symposium on Information Vizualization 2000, Seite 115. Washington, DC, USA, IEEE Computer Society, (2000)