1. Application Data for Beckman Instruments, DU-9-B. Barnes, R. B., Richardson, D., Berry, J. W., and Hood, R. L. (1945).
2. Belke, J., and Dierkesmann, A. (1948). Arch. exp. Path. Pharmak., 205, 629.
3. Bills, C. E., McDonald, F. G., Niedermeier, W., and Schwartz, M. C. (1949). Anal. Chem., 21, 1076.
4. Bohnstedt, R. M., Herrmann, R., Baumann, R., and Fiiller, H. (1953). Arztl. Forsch., 7, 82.
5. Herrmann, R. (1952). Z. ges. exp. Med., 118, 187.