1. BARMAN, T. E. (1969).Enzyme handbook. Vol. 1. Springer-Verlag, Berlin.
2. BOUILLENNE, R. and BOUILLENNE-WALRAND, M. (1955). Auxins et laiturage.Report of the 14th International Horticultural Congress,1, 231–8.
3. DIXON, M. and WEBB, E. C. (1979).Enzymes. 3rd Ed., Longman Group Ltd, London.
4. GABE, M. (1976).Histological techniques. Masson, Paris.
5. STONIER, T. (1972). The role of auxin protectors in autonomous growth.Colloques Inter-nationaux C.N.R.S. No. 193, Les cultures de tissus de plantes.