1. Darriet, H., Darriet, J., Cassaigne, A., and Neuzil, E. (1975)Acta Cryst. B 31, 469.
2. Hamilton, W. C. (1965)Acta Cryst. 18, 502.
3. International Tables for X-ray Crystallography (1974) Vol. IV, (Kynoch Press, Birmingham) (Present distributor D. Reidel Dordricht).
4. Johnson, C. K. (1976)Ortep II. ReportOrnl-5138. (Oak Ridge National Laboratory, Tennessee).
5. Kafarski, P., and Mastalerz, P. (1984)Beitr. Wirkst. Forssh.,21, 1.