1. ABDALLA, F. H., and ROBERTS, E. H., 1969. The effect of seed storage conditions on the growth and yield of barley, broad beans and peas. Ann. Bot., 33, 169–84.
2. ANDERSEN, A. M., 1950. The interpretation of normal and abnormal seedlings in some cereals. Proc. int. Seed Test. Ass., 16, 197–213.
3. ANDERSEN, A. M., 1954. A study of normal and abnormal seedlings of some small-seeded legumes. Proc. Ass. off. Seed Analysts, N. Am., 44, 188–201.
4. AUSTIN, R. B., 1963. Yield of onions from seed as affected by place and method of seed production., J. hort. Sci., 38, 277–285.
5. BALLARD, L. A. T., 1967. Effect of carbon dioxide on the germination of leguminous seeds. In Physiology, Ecology and Biochemistry of Germination, ed. H. Borriss, 209–19. Ernst-Moritz-Arndt-Universität, Greifswald.