1. Adachi, H., T. Mitsuyu,, O. Omazaki, and K. Wasa, 1985: in Proceedings of the 9th Symposium on Ion sources and Ion assisted technology, Japan, Edited by T. Takagi, p.373.
2. Adachi, H., T. Mitsuyu, O. Omazaki, and K. Wasa, 1985: Jpn. J. Appl. Phys., 24, 287.
3. Adachi, H., T. Mitsuyu, O. Yamazaki, and K. Wasa, 1986: J. Appl. Phys., 60, 736.
4. Atkin, R. B., 1972: Ferroelectrics, 3, 213.
5. Bondurant, D. W., and F. P. Graninger, 1989: IEEE Spectrum, 26, 30.