Evaggelia-Aggeliki Karabassi Georgios Papaioannou Charalampos Fretzagias Theoharis Theoharis Exploiting multiresolution models to accelerate ray tracing. 91-98 2003 27 Computers & Graphics 1 http://dx.doi.org/10.1016/S0097-8493(02)00247-9 db/journals/cg/cg27.html#KarabassiPFT03