1. Les Huntley, IEEE Trans. Inter. Meas.,36, No. 36, 908 (1987).
2. O. V. Karpov, A. E. Sarandi, F. P. Shakirzyanova, and V. M. Shul'ga, Prib. Tekh. Éksp., No. 1, 6 (1993).
3. GOST 8.027-89. GSI. State Primary Standard and Official Calibration Scheme for Electromotive Force and DC Voltage Measuring Instruments [in Russian].
4. L. N. Bryanskii and B. N. Krupin, ?Investigations in general and quantum metrology,? in: Scientific Papers of the VNIIFTRI [in Russian], Moscow (1991), p. 16.