1. V. I. Klassen ed. V. A. Mokrousov, An Introduction to the Theory of Flotation. Butterworth,London (1963).
2. A. M. Gaudin, Flotation,2nd ed. McGraw-Hill, N.Y. (1957).
3. S. I. Mitrofanov ed. V. G. Kushnikova, Tsevt. Metally, N. Y.37 (6), 15-17 (1964).
4. P. C. Rankin ed. A. T. Wilson, J. Colloid Sci.30 (3), 277-282 (1969).
5. J. J. Predali, c.r. hebd. Seanc. Acad. Sci., Paris 265,477-480 (1967).