Matteo Dellepiane Marco Callieri Massimiliano Corsini Paolo Cignoni Roberto Scopigno Flash Lighting Space Sampling. 217-229 2009 MIRAGE http://dx.doi.org/10.1007/978-3-642-01811-4_20 conf/mirage/2009 db/conf/mirage/mirage2009.html#DellepianeCCCS09