1. I. I. Kirenkov et al., Metrologia,10, No. 2 (1974).
2. Ya. S. Agranovich and D. N. Astrov, Izmer, Tekh., No. 4 (1977).
3. Ya. S. Agranovich and V. M. Malyshev, Izmer. Tekh., No. 7 (1974).
4. A. T. Berestov and V. M. Malyshev, Tr. VNIIFTRI, No. 32 (62) (1977).
5. L. B. Belyanskii, Candidates Dissertation, VNIIFTRI, Moscow (1969).