1. Boyd, W. C. 1956. Fundamentals of Immunology, 3d Ed., p. 56. Interscience Publishers Inc., New York.
2. Burtin, P. 1955. Bull. Soc. Chim. biol.37, 977.
3. Cinader, B. etWeitz, B. 1950. Nature (Lond.)166, 785.
4. Cinader, B. etWeitz, B. 1953. J. Hyg. (Lond.)51, 293.
5. Cohn, M. etPappenheimer, Jr.,A. M. 1949. J. Immunol.63, 291.