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3. J. Dyson and P. Noble, J. Sci. Instrum.,41, No. 5 (1964).
4. E. S. Wentzel, Theory of Probability [Russian translation], Fizmatgiz, Moscow (1962).
5. V. I. Sergeev, Bases of the Instrumental Accuracy of Electromechanical Circuits [in Russian], Izd. AN SSSR, Moscow (1963).