1. . Spherical color space in Riemann geometry. Twenty ninth European Conference on Visual Perception ECVP2006. St. Petersburg, Russia, August 2006, Vol. 35. p 186.
2. . Theories and Models of Color Vision. Chapter 8 in Color Science: Concepts and Methods, Quantitative Data and Formulae, 2nd edition. New York: Wiley; 2000. p 582–690.
3. Spherical Model of Color and Brightness Discrimination