1. Berson, S. A., and Yalow, R. S., J. Clin. Invest., 39, 1157 (1960).
2. Berson, S. A., Yalow, R. S., Bauman, A., Rothschild, M. A., and Newerly, K., J. Clin. Invest., 35, 170 (1956).
3. Yalow, R. S., and Berson, S. A., Radioactive Pharmaceuticals, AEC Symposium Series No. 6, CONF 651111, 1966 April, 265.
4. Berson, S. A., and Yalow, R. S. (unpublished observations).
5. Hunter, W. M., and Greenwood, F. C., Nature, 194, 495 (1962).