1. Brouwer, R., Hoogland, A.: Responses of bean plants to root temperatures ii. Anatomical aspects. J. I.B.S. 1964, 23?31 (1964)
2. Brouwer, R., Kleinendorst, A., Locher, J.Th.: Growth responses of maize plants to temperature. In Plant response to climatic factors, Proc. Uppsala Sym. 1970, pp. 169?174, Unesco 1973
3. Clarkson, D.T.: The effect of abscisic acid on the rate of production and composition of xylem sap from detached root systems of barley. ARC Letcombe Lab. Ann. Rep. 1974, 16?19 (1975)
4. Clarkson, D.T.: Further investigations of the physiological responses of roots to cooling. ARC Letcombe Lab. Ann. Rep. 1975 6?8 (1976)
5. Clarkson, D.T., Shone, M.G.T., Wodd, A.V.: The effect of pretreatment temperature on the exudation of xylem sap by detached barley root systems. Planta (Berl.) 121, 81?92 (1974)