1. GOST (State Standard) R 51618-2009: Russian Brandies. General Specifications, 2000.
2. GOST (State Standard) 12494-77: Brandies for Export Delivery, 1986.
3. GOST (State Standard) 26931-86: Row and Final Food Products. Methods for Copper, 1986.
4. Schwarzenbakh, G. and Flaschka, H.A., Complexometric Titration, Methuen, 1969.
5. Nagaradju, V., Goje, T., and Crouch, A.M., Anal. Sci., 2007, vol. 23, p. 493.