3Johnson B, Shneiderman B. Tree-maps: a space-filling approach to the visualization of hierarchical information structures [C] //Proceedings of IEEE Visualization Conference. Los Alamitos: IEEE Computer Society Press, 1991: 284-291.
4Rohertson G G, Mackinlay J D, Card S K. Cone trees: animated 3D visualizations of hierarchical information [C] // Proceedings of ACM CHI Conference on Human Factors in Computing Systems. New York: ACM Press, 1991:189-194.
5Zhao S, McGuffin M J, Chignell M H. Elastic hierarchies: combining treemaps and node-link diagrams [C]//Proceedings of IEEE Symposium on Information Visualization. Los Alamitns: IEEE Computer Society Press, 2005:57-64.
6Bruls M, Huizing K, Van Wijk J J. Squarified treemaps [C] //Proceediags of Joint Eurographies and IEEE TCVG Symposium on Visualization. Aire-la-Ville: Eurographics Association Press, 2000: 33-42.
7Shneiderman B, Wattenberg M. Ordered treemap layouts[C]//Proceedings of IEEE Symposium on Information Visualization. Los Alamitos: IEEE Computer Society Press, 2001 : 73-78.
8Bedersou B B, Shneiderman B, Wattenberg M. Ordered and quantum treemaps: making effective use of 2D space to display hierarchies [J]. ACM Transactions on Graphics, 2002, 21 (4) : 833-854.
9Tu Y, Shen H W. Visualizing changes of hierarchical data using treemaps [J]. IEEE Transactions on Visualization and Computer Graphics, 2007, 13(6):1286-1293.
10Wood J, Dykes J. Spatially ordered treemaps [J]. IEEE Transactions on Visualization and Computer Graphics, 2008, 14(6) : 1348-1355.