1. All-Union State Standard 8.417-81 (ST SÉV 1052-78): The State System of Measurements: Units for Physical Quantities [in Russian].
2. K. P. Shirokov and M. G. Boguslavskii, The International System of Units, Yu. V. Tarbeev (ed.) [in Russian], Izd. Standartov, Moscow (1984).
3. M. F. Malikov, The Principles of Metrology [in Russian], Kommerpribor, Moscow (1949).
4. O. D. Hvolson, Physics Textbook [in German], Berlin (1925), Vol. 1, p. 14.
5. S. V. Gorbatsevich et al., Izmer. Tekh., No. 7, 63 (1971).