[1] Danny Holten, "Hierarchical Edge Bundles: Visualization of Adjacency Relations in Hierarchical Data", IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS, VOL. 12, NO. 5, SEPTEMBER/OCTOBER 2006
[2] Jeromy Carriere, Rick Kazman, "Interacting with Huge Hierarchies: Beyond Cone Trees", Computer Graphics Lab, Department of Computer Science, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
[3] Louis Bavoil, Kevin Myers, "Order Independent Transparency with Dual Depth Peeling", NVIDIA Corporation, 2701 San Tomas Expressway, Santa Clara, CA 95050, February 2008
1.7.4
