1. L. M. Risover, in: Abstracts of Reports to the Eighth All-Union Conference on Radio Astronomy [in Russian], Pushchino (1975), p. 131.
2. B. P. Latkhi, Data-Transmission Systems [in Russian], Svyaz'izdat, Moscow (1971).
3. N. K. Ignat'ev, Izv. Vyssh. Uchebn. Zaved. Radiotekh.,4, No. 6, 684 (1961).
4. A. G. Obukhov, in: Abstracts of Reports to the Eighth All-Union Conference on Radio Astronomy [in Russian], Pushchino (1975), p. 130.
5. N. A. Esepkina, D. V. Korol'kov, and Yu. N. Pariiskii, Radio Telescopes and Radiometers [in Russian], Izb. Nauka, Moscow (1973).