1. W. Li, Z.L. Jin, Z.H. Zhang, Chem. Prog., Vol15, p.364.
2. M. Sando, A. Towata and A. Tsuge, Kagaku Kogaku Ronbunshu, Vol18(3), p.308.
3. Tianjin Research and Design Institute of Chemical Industry, Inorganic Chemical Industry [M], (Chemical Industry Publishing House), 1996, p.92.
4. B.R. Pamplin, Crystal Growth[M], Pergamon Press, 1980, p.58.
5. B. W. Burton, N. Cabrera and F.C. Frank, Phil. Trans. Roy. Soc., Vol234, p.310, p.322.