Christian Ledergerber Gaël Guennebaud Miriah D. Meyer Moritz Bächer Hanspeter Pfister Volume MLS Ray Casting. 1372-1379 2008 14 IEEE Trans. Vis. Comput. Graph. 6 http://doi.ieeecomputersociety.org/10.1109/TVCG.2008.186 db/journals/tvcg/tvcg14.html#LedergerberGMBP08