1. A. M. Turichin, Electrical Measurements of Nonelectrical Quantities [in Russian], Gosénergoizdat, Moscow (1959).
2. B. S. Sotskii, Transducers for Automatic Testing and Control Systems [in Russian], Mashgiz (1959).
3. B. K. Shchukin, Author's Certificate No. 113306, Bulletin of Inventions No. 6 (1959).
4. N. N. Luchinskii, S. A. Strelkov, and A. P. Dubrovskii, Author's Certificate No. 101645, Bulletin of Inventions No. 10 (1955).