D. Shreiner, M. Woo, J. Neider and T. Davis: OpenGL Programming Guide: The Official Guide to Learning OpenGL, Version 2 (5th Edition). Addison-Wesley Professional, Reading, 2005.
H. Stanislaw and L. A. Olzak: Parametric methods for gamma and inverse gamma correction, with extensions to halftoning. Behavior Research Methods, Instruments,& Computers, 22, 402-408, 1990.