1. Proger, S., et al., Science, 104, 389 (1946).
2. Roth, L. W., et al., Proc. Soc. Exp. Biol. Med., 70, 116 (1949).
3. Becker, E. H., and Munoz, J., J. Immunol., 63, 173 (1949).
4. Kabat, E. A., and Mayer, M. M., Experimental Immunochemistry (Charles C. Thomas, Springfield, Illinois, 1961).
5. Ouchterlony, O., Acta Pathol. Microbiol. Scand., 32, 231 (1953).