1. Moncrieff, R. W., The Chemical Senses, 760 (CRS Press, Cleveland, 1967).
2. Hornstein, I., Flavor Chemistry, Advances in Chemistry Series 56, 278 (American Chemical Society, Washington, 1966).
3. Schultz, H. W., Day, E. A., and Libbey, L. M., Symposium on Foods: The Chemistry and Physiology of Flavors, 552 (AVI Publishing Co., Westport, Connecticut, 1967).
4. Davies, J. T., J. theor. Biol., 8, 1 (1965).
5. Dravnieks, A., Nature, 194, 245 (1962).