1. A. A. Lebedev and A. I. Uvarov, Radiotekhn. i Élektron., 12:895 (1967).
2. M. A. Berg and S. A. Garyainov, Radiotekhnika, 17 (1):51 (1962).
3. R. E. Smolyanskii, in: Abstracts of Papers presented at Third Conf. on Physics of p-n Junctions, Tbilisi (1966).
4. C. T. Sah, R. N. Noyce, and W. Shockley, Proc. IRE, 45:1228 (1957).
5. A. A. Lebedev, A. I. Uvarov, and V. E. Chelnokov, Radiotekhn. i lektron., 11:145 8 (1966).