1. B. P. Chakravarti(1960 ). Pathogenic capabilities of the wheat stem rust fungusPucciniagraminis triticiin certain rust resistant and tolerant varieties of wheat . Ph.D. Thesis . University of Minnesota.
2. E. B. Hayden(1956 ). Progressive development of infection byPuccinia graminisvar.triticiEriks. & E. Henn. (Guyot) on certain varieties of wheat and the relation of stem rust to yield . Ph.D. Thesis . University of Minnesota.