1. Cassim, J. Y., Rafferty, C. N., McConnell, D. G.: Ultraviolet and visible circular dichroic studies on retinal photoreceptor outer segment membranes. Biophysical society abstracts, sixteenth annual meeting, pp. 205a?206a. Toronto, Canada, February 24?27, 1972
2. Honig, B., Kuhn, P., Ebrey, T. G.: Intrinsic optical activity of retinal isomers. Implications for the circular dichroism spectrum of rhodopsin. Biochemistry 12, 1637?1643 (1973)
3. Mommaerts, W. F. H. M.: Circular dichroism and the conformational properties of visual pigments. In: The retina (eds. B. R. Straatsma, et al.), pp. 225?234. Los Angeles: University of California Press 1969
4. Parkes, J. H., Rockey, J. H., Liebman, P. A.: Circular dichroism of rhodopsins and porphyropsins. Biochim. biophys. Acta (Amst.) 428, 1?12 (1976)
5. Rafferty, C. N.: Aromatic residues are perturbated following light absorption by rhodopsin. EMBO workshop on transduction mechanism of photoreceptors abstracts, 71, Jülich, West Germany, October 4?8, 1976