1. H. J. Schulze, Colloid Scientific Aspects of Mineral Processing Especially of Flotation and Flocculation, IX-th European Chemistry of Interfaces Conference. May 19–25 1986. Zakopane, Poland.
2. J. Leja, Surface Chemistry of Froth Flutation, Plenum Press, New York-London, 1982.
3. D. W. Fuerstenau and S. Raghavan, in Flotation (M. C. Fuerstenau, Ed.), AIME, New York, 1976, p. 21.
4. J. Laskowski, The Physical Chemistry in Processes of Mechanical Enrichment of Minerals, Śląsk, Katowice, 1969, p. 202.
5. P. Staszczuk, The Role of Water Layers in Enrichment Process of Minerals, Rudy Metale, accepted for publication.