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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. Aplan, F. F., and Fuerstenau, D. W. (1962), Principles of Nonmetallic Mineral Flotation, in Froth Flotation-50th Anniversary Volume. D. W. Fuerstenau, ed., AIME, New York, pp. 170–214.
5. Beloglazov, K. F. (1956), Basic Rules ofthe Flotation Process (in Russian), Rep. Leningr. Min. Institute, Metallurgizdat, Moscow.