1. Kent, J. F., and Fife, jun., E. H., Amer. J. Trop. Med. and Hyg., 12, 103 (1964).
2. Fogel, B. J., Hook, W. A., and Fife, jun., E. H., Soc. Ped. Res. Prog, and Abstr. (1965).
3. Hook, W. A., and Muschel, L. H., Proc. Soc. Exp. Biol. and Med., 117, 292 (1964).
4. Ibe, E. C., and Wardlaw, A. C., Immunology, 7, 586 (1964).
5. Kabat, E. A., and Mayer, M. M., Experimental Immunochemistry, second ed. (Thomas, Springfield, 1961).