1. Alam, Z. (1936). “Self-sterility inEruca sativa Lam.”J. Genet. 32, 257–76.
2. Amici, B. (1824). “Observations microscopiques sur espèces de plante.”Ann. Sci. nat. (1),21, 41–70.
3. Anderson, E. &Sax, K. (1934). “A cytological analysis of sterility inTradescantia.”Bot. Gaz. 95, 609–21.
4. Andronescu, D. I. (1915). “The physiology of the pollen ofZea mays with special regard to vitality.” (Thesis, Univ. Illinois.) Cited fromJ. agric. Res. 44, 1932.
5. Ayyangar, G. S. (1931). “Pollen tube entry into the cotton ovule.”Agric. Live-Stk India, pp. 471.