1. E. Shugam and H. Zhdanov,Acta Physicochim., USSR,20, 247 (1945).
2. H. Zhdanov,C. R. Acad. Sci., USSR,31, 350 (1941).
3. T. Kitazawa,J. Mater. Chem.,8, 671 (1998).
4. T. Kitazawa, Ph. D. Thesis, University of Tokyo, Tokyo, Japan (1992).
5. T. Kitazawa, S. Nishikiori, R. Kuroda, and T. Iwamoto.Chem. Lett., 459 (1988).