1. J. L. Jackel, C. E. Rice, and J. J. Veselka, Appl. Phys. Lett.,41, No. 7, 607?608 (1982).
2. K. S. Buritskii, E. M. Zolotov, and V. A. Chernykh, Pis'ma v Zh. Tekh. Fiz.,9, No. 2, 72?75 (1983).
3. V. A. Gan'shin, Yu. N. Korkishko, and V. Z. Petrova, Pis'ma v Zh. Tekh. Fiz.,9, No. 19, 1197?1200 (1983).
4. Yu. A. Bobrov, V. A. Ganshin, V. Sh. Ivanov, et al., Phys. Stat. Sol. A.,123, 317?324 (1991).
5. J. L. Jackel, D. H. Olson, A. M. Glass, J. Appl. Phys.,52, No. 7, 4855?4857 (1981).