1. Aschoff, J., 1970, Circadian rhythm of activity and of body temperature, in: “Physiological and behavioral temperature regulation”, J.D. Hardy, A.P. Gagge, J.A.J. Stolwijk, eds., Springfield: Illinois
2. Biebach, H., 1977, Reduktion des Energiestoffwechsels und der Körpertemperatur hungernder Amseln (Turdus merula). J. Ornithologie., 118: 294–300.
3. Binkley, S., Kluth, E., Menaker, M., 1971, Pineal function in sparrows: Circadian rhythms and body temperature. Science., 174: 311–314.
4. Chossat, Ch., 1843, Recherches experimentales sur l’inanition. Des effects de l’inanition sur la chaleur animais. Ann Sci naturelles 2 Serie., 20: 293–326
5. Dawson, W.R., Hudson, J.W., 1970, Birds, in: “Invertebrates and Nonmammalian vertebrates (comparative Physiology of Thermoregulation, I),” G.C. Whittow, ed., Academic Press: New York.