Ove Daae Lampe Ivan Viola Nathalie Reuter Helwig Hauser Two-Level Approach to Efficient Visualization of Protein Dynamics. 1616-1623 2007 13 IEEE Trans. Vis. Comput. Graph. 6 http://doi.ieeecomputersociety.org/10.1109/TVCG.2007.70607 db/journals/tvcg/tvcg13.html#LampeVRH07