1. P. Langcake, 1970 : Studies on the biochemical basis of monogenic resistance of tomato toFusarium oxysporumf.lycopersici. Ph. D. Thesis , Univ. Birmingham.
2. C. J. Pollock, 1971 : Studies on the biochemical basis of resistance of tomato varieties toVerticillium albo-atrum. Ph. D. Thesis , Univ. Birmingham.