1. Ballard, D.H. & Brown, C.M. (1982). Computer vision. New Jersey: Prentice Hall.
2. Integration of depth modules: Stereo and shading;Bülthoff;Journal of the Optical Society of America A,1988
3. Christou, C.G. (1994). Human Vision and the Physics of Natural Images, unpublished D. Phil. thesis, University of Oxford, Oxford.
4. Cohen, M.F. & Wallace, J.R. (1993). Radiosity and realistic image synthesis. New York: Academic Press.
5. Modelling the interaction of light between diffuse surfaces;Goral;ACM Computer Graphics—SIGGRAPH,1984