C. Appert and J. D. Fekete, OrthoZoom scroller, Proceedings of the SIGCHI conference on Human Factors in computing systems , CHI '06, 2006.
DOI : 10.1145/1124772.1124776
URL : https://hal.archives-ouvertes.fr/inria-00538428

C. Plaisant, J. Grosjean, and B. B. Bederson, Space- Tree: Supporting Exploration in Large Node Link Tree, Design Evolution and Empirical Evaluation, Proceedings of the IEEE Symposium on Information Visualization (InfoVis'02) IEEE Computer Society, p.57, 2002.