1. V. A. Davankov, Izv. Akad. Nauk SSSR, Ser. Khim., 2407 (1972).
2. V. A. Davankov, S. V. Rogozhin, and A. A. Kurganov, Zh. Neorg. Khim.,17, 2163 (1972).
3. G. G. Aleksandrov, Yu. T. Struchkov, et al., Zh. Strukt. Khim.,13, 671 (1972).
4. Hilger and Watts, System Bulletin, 3, September (1970).
5. M. Dobler and B. Duerr, Least Squares Orientation Matrix Program, Zurich (1968).