1. Schaub, J. G., and Foley, M. K., “Diagnostic Bacteriology”, 4th edit., 178 (1952).
2. Yow, E. M., and Townsend, E. S., “Antibiotics and Chemotherapy”, 3, 709 (1953).
3. Haynes, W. C., J. Gen. Microbiol., 5, 939 (1951).
4. Gordon, J., and McLeod, J. W., J. Path. and Bact., 31, 185 (1928).