Fruits, foliage and the evolution of primate colour vision.
B C Regan, C Julliot, B Simmen, F Viénot, P Charles-Dominique, and J D Mollon
Philos Trans R Soc Lond B Biol Sci. 2001 March 29; 356(1407): 229–283. doi: 10.1098/rstb.2000.0773.PMCID: PMC1088428