1. J. Crofton and S. Sriram, IEEE tans. Elec. Dev. Vol 43 (1996), p.2305.
2. M. Treu, R. Rupp, H. Kapels and W. Bartsch, Mat. Sci. Forum Vol. 353-356 (2001), p.679.
3. F. A. Padvani and R. Stratton, Solid-State Electronics Vol 9 (1966), p.695.
4. T. Hatakeyama and T. Shinohe, Mat. Sci. Forum, Vol 389-393 (2002), p.1169 Corresponding author: tetsuo2. hatakeyama@toshiba. co. jp, Phone: +81-44-549-2142, Fax: +81-44-520-1501.
5. 0. 5.