1. Kjeldgaard, N. O., Maaløe, O., and Schaechter, M., J. Gen. Microbiol., 19, 607 (1958).
2. Manual of Microbiological Methods, Soc. Amer. Bacteriologists (McGraw-Hill Book Co., New York, 1957).
3. Herbert, D., Elsworth, R., and Telling, R. C., J. Gen. Microbiol., 14, 601 (1956).
4. Mandelstam, J., Biochem. J., 69, 103 (1958). Moyed, H. S., and Umbarger, H. E., Physiol. Revs., 42, 444 (1962).
5. Monod, J., Ann. Inst. Pasteur, 79, 390 (1950). Récherches sur la Croissance des Cultures Bacteriennes (Herman and Cie., Paris, 1942).