1. Allen, F. H., Bellard, S., Brice, M. D., Cartwright, B. A., Doubleday, A., Higgs, H., Hummelink, T., Hummelink-Peters, B. G., Kennard, O., Motherwell, W. D. S., Rogers, J. R., and Watson, D. G. (1979)Acta Crystallogr. B35, 2331.
2. Behm, H. J., and Beurskens, P. T. (1985)Z. Kristallogr. 170, 10 (PATSYS).
3. Bergerhoff, G., Kilger, B., Witthauer, C., Hundt, R., and Sievers, R. (1984)Inorganic Crystal Structure Database (Institut f�r Anorganische Chemie der Universit�t, Bonn).
4. Beurskens, G., Noordik, J. H., and Beurskens, P. T. (1980)Cryst. Struct. Comm. 9, 23 (BIJVOET).
5. Beurskens, P. T. (1985) InCrystallographic Computing 3, Sheldrick, G. M., Kr�ger, C., and Goddard, R., eds. (Clarendon Press, Oxford), p. 216.