1. Weil-Malherbe, H., Biochem. J., 40, 351 (1946).
2. Pullman, B., and Pullman, A., Proc. U.S. Nat. Acad. Sci., 44, 1197 (1958).
3. Liquori, A. M., Ascoli, F., Botrè, C., and De Lerma, B. (to be published).
4. Lipson, H., and Taylor, C. A., “Fourier Transforms and X-Ray Diffraction” (G. Bell and Sons, London, 1958).
5. Liquori, A. M., Acta Cryst., 9, 535 (1956).