1. Aleksandrovich, K. M. (1973), Principles of the Use of Reagents During Flotation of Potassium Ores (in Russian), Nauka i Tekhnika, Minsk, Beloruss. SSR.
2. Aleksandrovich, K. M. (1975), Flotation of Water-Soluble Salts (in Russian), Nauka, Moscow.
3. Aplan, F. F. (1966), Flotation, in Kirk-Othmer Encyclopedia of Chemical Technology, Vol. 9, 2nd ed. Wiley-Interscience, New York, pp. 380–398.
4. Beloglazov, K. F. (1956), Basic Rules of the Flotation Process (in Russian), Rep. Leningr. Min. Institute, Metallurgizdat, Moscow.
5. Belov, V. N., and Sokolov, A. F. (1971), Extraction and Processing of Potassium Salts (in Russian), Khimiya, Leningrad.