1. S.-F. Lu, J.-Q. Huang, Y.-H. Lin, and J.-L. Huang (1987).Acta Chim. Sinica. 3, 191.
2. H. Akashi, and T. Shibahara (1989).Inorg. Chem. 28, 2906.
3. D. M. Saysell, and A. G. Sykes (1995).J. Cluster Sci. 6, 499.
4. S.-F. Lu, M.-Y. Shang, J.-Q. Huang, J.-L. Huang, and J.-X. Lu (1988).Sci. Sinica (Series B) 4(2), 47.
5. Y. Zheng, M.-Y. Shang, L.-N. Zhang, J.-L. Huang, and J.-X. Lu (1983).Spect. Anal. (Ch.). 2, 72.