1. Bureau of Interchangeability. “Guides with flat springs”. Technical Manual [in Russian] (Moscow, 1957).
2. A. S. Valedinskii, “Spring couplings and mechanisms in measuring instruments”. MVTU (Moscow Higher Technical School) collection [in Russian] (Mashgiz, Moscow, 1960).
3. J. E. Plainevaux, Nuovo Cimento, No. 10 (1953).
4. Idem, ibid., No. 1 (1954).
5. Idem, ibid., No. 11 (1954).