1. Controlled field trial in British Guyana school-children of heat-killed-phenolized and acetone-killed lyophilized-typhoid vaccines;Ashcroft;Am. J. Hyg.,1964
2. A controlled field trial of the effectiveness of acetone-dried and inactivated and heat-phenol-inactivated typhoid vaccines in Yugoslavia;Yugoslav Typhoid Commission;Bull. WHO,1964
3. Evaluation of typhoid vaccines in the laboratory and in a controlled field trial in Poland;Polish Typhoid Committee;Bull. WHO,1965
4. Laboratory assays of different types of field trial typhoid vaccines and relationship to efficacy in man;Pittman;J. Bacteriol.,1966
5. Isolation and characterization of galE mutant Ty21a of Salmonella typhi: a candidate strain for a live, oral typhoid vaccine;Germanier;J. Infect. Dis.,1975