1. Bi-directional path tracing;Lafortune,1993
2. Metropolis light transport;Veach,1997
3. Pharr M., Jakob W., Humphreys G.. Scenes for pbrt-v3. http://pbrt.org/scenes-v3.html; 2018. Accessed: 25/04/2018.
4. Instant radiosity;Keller,1997
5. Radiance caching for efficient global illumination computation;Krivanek;IEEE Trans Vis Comput Graph,2005