1. M. J. Kluger, in: Environmental Physiology III, vol. 20, p. 109. Ed. D. Robertshaw. University Park Press, Baltimore 1979.
2. E. Satinoff and R. Hendersen, in: Handbook of Operant Behavior, p. 153. Ed. W. K. Konig and J. E. R. Staddon. Prentice-Hall, Engelwood Cliffs, NJ, 1977.
3. J. Bligh, Temperature Regulation in Mammals and Other Vertebrates. North-Holland, Amsterdam 1973.
4. D. L. Jackson, J. Neurophysiol.30, 586 (1967).
5. K. E. Cooper, W. I. Cranston and A. J. Honour, J. Physiol. (Lond.)191, 325 (1967).