1. Ando, S., Fukui, T.. J. crystal Growth. 98, 646 (1989)
2. Bai, Z. G., Yu, D. P., et al.. Chem. Phys. Letters. 303, 311 (1999a)
3. Bai, Z. G., D. P. Yu, Wang, J. J., Zou, Y. H., Qian, W., Fu, J. S., Feng, S. Q., Xu, J., You, L. P.. Mater. Sci. Eng.. B72, 117–120 (1999b)
4. Bennett, A. I., Longini, R. L.. Phys. Rev.. B 116, 53 (1959)
5. Bentosela, F., Exner, P., Zagrebnov, V. A.. Phys. Rev.. B 57, 1382 (1998)