V. Zacharias. Submitted to the 7th International Conference on Knowledge Management - Special Track on Knowledge Visualization and Knowledge Discovery, (2007)
H. Yoo, и S. Cheon. Proceedings of the 2006 Asia-Pacific Symposium on Information Visualisation - Volume 60, стр. 143--146. Darlinghurst, Australia, Australia, Australian Computer Society, Inc., (2006)