Patrice Perez Mathias Paulin Mouna El Hafi Richard Fournier Optimized Net Exchange Monte Carlo Simulation for Participating Media. 69- 2002 WSCG (Posters) http://wscg.zcu.cz/wscg2002/Papers_2002/E11.pdf db/conf/wscg/wscg2002.html#PerezPHF02