1. Brandriss, M. W., and Bullock, W. E., Fed. Proc., 27, 263 (1968).
2. Bullock, W. E., and Kantor, F. S., J. Immunol., 94, 317 (1965).
3. Fahey, J. L., and McKelvey, E. M., J. Immunol., 94, 84 (1965).
4. Cheng, W. C., and Talmage, D. W., J. Immunol., 97, 778 (1966).
5. Campbell, D. M., Garvey, J. S., Cremer, N. E., and Sussdorf, D. M., Methods in Immunology, 79 (Benjamin, W. A., Inc., New York, 1963).