1. Boenigk, D., and Mootz, D. (1988)J. Am. Chem. Soc.,110, 2135.
2. Djinović, K., and Golić, L. (1992)Acta Cryst. C48, 1046.
3. Hartl, H. (1975)Acta Cryst. B31, 1781.
4. Hensen, K., Pullmann, P., and Bats, J. W. (1988)Z. anorg. allg. Chem. 556, 62.
5. International Tables for X-ray Crystallography (1974) (Kynoch Press, Birmingham, England), Vol. IV, pp. 72, 99, 149 (present distributor: Kluwer Academic Publishers, Dordrecht, the Netherlands).