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2. Deutsche Electrotechnik, 2, 10 (1956).
3. W. Brendler, Deutsche Electrotechnik, 7, 333 (1957).
4. Sun Su-fo, Measurements of Power by Means of Semiconductors [in Russian] (Gosenergoizdat, 1958).
5. H. E. M. Barlow, Proc. IEE, Part B,102, 179 (1955).