1. M. Buttiker and R. Landauer, Phys. Rev. Lett. 49, 1739 (1982).
2. M. J. Hagman, J. Appl. Phys. 78, 25 (1995).
3. A. B. Pashkovskii, Fiz. Tekh. Poluprovodn. 29, 1712 (1995) [Semiconductors 29, 893 (1995)].
4. A. B. Pashkovskii, Pis’ma Zh. Tekh. Fiz. 21(21), 13 (1995) [Tech. Phys. Lett. 21, 867 (1995)].
5. E. I. Golant, A. B. Pashkovskii, and A. S. Tager, Pis’ma Zh. Tekh. Fiz. 20(21), 74 (1994) [Tech. Phys. Lett. 20, 886 (1994)].