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3. E. N. Bushuev, E. V. Kozyulina, B. M. Larin, and M. Yu. Oparin, “A Method for Calibrating pH Meters,” RF Patent No. 2244294 C2 ICI G 01 N 27/00, G 01 R 35/00, Izobret., No. 1 (2005).
4. A. K. Rodionov, “A Method for Calibrating pH Meters and a Device for Embodying It,” RF Patent No. 2324927 C2 ICI G01N 27/02, G01R 35/00, Izobret., No. 14 (2008).
5. OST (Industry Standard) 34-70-953.2-88: Process Waters for Power Stations. The Method of Preparing Purified Water for Chemical Analysis (Minenergo, Moscow, 1988) [in Russian].