Toshiya Hachisuka Wojciech Jarosz Richard Peter Weistroffer Kevin Dale Greg Humphreys Matthias Zwicker Henrik Wann Jensen Multidimensional adaptive sampling and reconstruction for ray tracing. 2008 27 ACM Trans. Graph. 3 http://doi.acm.org/10.1145/1360612.1360632 db/journals/tog/tog27.html#HachisukaJWDHZJ08