1. Iwabuchi, S., (unpublished) Takeishi, Y., Natori, K. and Iwabuchi, S. Proc. 20th Int. Conf. of the Physics of Semiconductors (World Scientific), p.77, 1990
2. For example, see Prog. Theor. Phys. supplement No.84, ed. by Nagaoka, Y. 1985
3. For example, see Mesoscopic Phenomena in Solids, ed. by Al'tshuler, B.L., Lee, P.A. and Webb, R.A. (North-Holland), 1991
4. Dennard R.H., et al., IEEE J. Solid-State Circuits, vol. sc-9, p. 256, 1974
5. Umbach, C.P., Washburn, S., Raibowitz, R.B. and Webb, R.A. Phys. Rev.B30, 4048 (1984)