1. International Tables for X-ray Crystallography (1974) Vol. IV (Kynoch Press, Birmingham, England).
2. Parkyani, L., and Bocelli, G. (1978)Cryst. Struct. Commun.,7, 335.
3. Prescott, P. I., and Selin (1964) Fr. patent 1,374,620 (Cl. C 07f), Oct. 9, 1964; U.S. Appl. Nov. 1, 1962;Chem. Abstr. 62, 7797 (1965).
4. Sheldrick, G. M. (1976)Shelx 76. Program for Crystal Structure Determination (University of Cambridge, Cambridge, England).