1. Abramzon, C.: Kirghiz and their ethnogenetic and historical cultural relations. Leningrad: Nauka 1971
2. Anfalova, T. V., Prytkov, A. N., Korobova, A. N., Kozlova, S. I., Philipov, I. K., Sharetz, V. D.: Medico-genetic study of isoletes in the Uzbekistan (in Russian). Genetika 11, 100?106 (1975)
3. Barnicot, N. A.: Ability to taste phenylthiourea. In: Human biology. An introduction to human evolution, variation and growth, G. A. Harrison, J. S. Weiner, J. M. Tanner, N. A. Barnicot, eds., pp. 230?231. New York-Oxford: Oxford University 1964
4. Bhalla, V.: Variations in taste threshold for PTC in population of Tibet and Ladakh. Hum. Hered. 22, 453 (1972)
5. Blakeslee, A. F., Salmon, M. R.: Odor and taste blindness. Eugen. News 16, 105 (1931)