1. Levitt, J.: Responses of plants to environmental stresses, Vol. I. New York: Academic Press 1980
2. Kramer, P.J., in: Adaptation of plants to water and high temperature stress, p. 7 (N.C. Turner, P.J. Kramer, eds.). New York: Wiley 1980
3. Grime, J.P.: Plant strategies and vegetation processes. Chichester: Wiley 1979
4. Salisbury, F.B., Marinos, N.G., in: Encyclopedia of plant physiology, Vol. 11, p. 707 (R.P. Pharis, D.M. Reid, eds.). Heidelberg: Springer 1985
5. Henry, J.P., Stephens, P.M.: Stress, health, and the social environment. New York: Springer 1977