1. M. A. Miller, Zh. Tekh. Fiz.,25, No. 11, 1972 (1955).
2. M. A. Miller and V. L. Talanov, Zh. Tekh. Fiz.,26, No. 12, 2755 (1956).
3. P. R. Cherep, Author's Abstract of Candidate's Dissertation [in Russian], Kiev Polytechnic Institute (1958).
4. H. M. Barlow, IRE Trans.,AP-7, 147 (1959).
5. J. R. Wait, IRE Trans.,AP-8, No. 4, 445 (1960).