1. Becker, E. L., Munoz, J., Lapresle, C., and Le Beau, L. J., J. Immunol., 67, 501 (1951).
2. Oudin, J., “Methods in Medical Research”, Year Book Publishers Chicago, 5, 335 (1952).
3. Oakley, C. L., and Fulthorpe, A. J., J. Path. Bact., 65, 49 (1953).
4. Augustin, R., and Hayward, B. J., Int. Arch. Allergy and Appl. Immunol., 6, 154 (1955).
5. Ouchterlony, Ö., Ark. Kemi, Min. Geol., 26, B, 1 (1949).