1. Saturation of the rod mechanism of the retina at high levels of stimulation;Aguilar;Optica Acta,1954
2. Colour vision: testing with a computer graphics system;Arden;Clinical Vision Sciences,1988
3. Barbur, J. (1980). The Spatial organisation of movement-detecting mechanisms in human vision. Ph.D. Thesis, University of London.
4. Distribution and morphology of human cone photoreceptors stained with anti-blue opsin;Curcio;Journal of Comparative Neurology,1991
5. Estevez, O. (1979). The fundamental data-base of normal and dichromatic colour vision. Ph.D Thesis, University of Amsterdam, Krips Repro Meppel, Amsterdam (reproduced in Wyszecki and Stiles).