1. H.J. Schulze, Physico-chemical Elementary Processes in Flotation, 1984, Elsevier, Amsterdam.
2. Untersuchung zum Elementarakt der Flotation;Scheludko;Freib. Forsch. Hefte A,1971
3. J.N. Israelachvili, Intermolecular and Surface Forces, 1992/2, Academic Press, London.
4. Techniques for measuring surface forces;Claesson;Adv. Colloid Interface Sci.,1996