1. Abdalla, M. M. F., 1970. Inbreeding, heterosis, fertility, plasmon differentiation and Phytophthora resistance in Solanum verrucosum
Schlechtd., and some interspecific crosses in Solanum. Agric. Res. Rep. 748.
2. Barker, H. D., 1923. A study of wilt resistance in flax. Bull. Minn. Univ. Agr. Exp. Stn Tech. 20.
3. Biffen, R. H., 1905. Mendel's laws of inheritance and wheat breeding. J. agric. Sci. 1:4–48.
4. Black, W., 1952. A genetical basis for the classification of strains of Phytophthora infestans. Proc. R. Soc. Edinb. 65: 36–51.
5. Bolley, H. L., 1901. Flax wilt and flax-sick soil. Bull. N. Dakota Agric. Exp. Stn 50.