1. Turo D., Johnson B., “Improving the visualization of hierarchies with treemaps: design issues and experimentation.”Proceedings of the 3rd conference on Visualization ‘92, 124–131 (1992)
2. Lü H., Fogarty J., “Cascaded treemaps: examining the visibility and stability of structure in treemaps.”Proceedings of graphics interface 2008., (2008)
3. Robertson G. G., Mackinlay J. D., Card S. K., “Cone trees: animated 3D visualizations of hierarchical information.”Proceedings of the SIGCHI conference on Hu-man factors in computing systems., 189–194 (1991)
4. Knuth D. E.,The. Art of Computer. Programming(Addison-Wesley, Reading, MA, 1968) Chapter1