1. Haase, M. A., Depydt, J. M., Cheng, H. and Pots, J. E., J. Appl. Phys., 1991, 59, 1173.
2. Toda, A., Nakamura, F., Namashima, Y. and Ishibashi, A., J. Cryst. Growth, 1997, 170, 461.
3. Mandel, G., Phys. Rev., 1964, 134A, 1073.
4. Kroeger, F. A., The Chemistry of Imperfect Crystals, North-Holland, Amsterdam, 1964, 2nd edn, 1967.
5. Marfaing, Y., Prog. Crystal Growth and Charact., 1981, 4, 317–343.