1. Gur, A., and Samish, R.M. (1968). The role of auxin and auxin destruction in the vigour effect induced by various apple rootstocks. (Submitted for publication.)
2. Jensen, W. A. (1962).Botanical histochemistry. W. H. Freeman Co., San Francisco.
3. Lavee, S. (1960). A research on the vigour of growth of fruit trees. Ph.D. dissertation, Hebrew University of Jerusalem.
4. Priestley, C. A. (1963). Carbohydrate resources within the perennial plant.Tech. Commun. Commonw. Bur. Hort. Plantn Crops., No. 27. East Malling, Maidstone, Kent.
5. Umbreit, W. W., Burris, R. H., and Stauffer, J. F. (1957).Manometric techniques. Burgess, Minneapolis.