1. Abramov, A.A., Flotatsionnye metody obogashcheniya (Flotation Methods), Moscow: Mosk Gos. Gorn. Univ., 2008.
2. Pirumov, A.I., Obespylevanie vozdukha (Air Dedusting), Moscow: Stroyizdat, 1981.
3. De Zhen, P.Zh., “Wetting: Statics and Dynamics,” Usp. Fiz. Nauk, 1987, vol. 151, no 4.
4. Summ, B.D., “Wetting Hysteresis,” Soros Educ. J., 1999, no. 7.
5. Drelich, J., Laskowski, J.S., and Pawlik, “Improved Sample Preparation and Surface Analysis Methodology for Contact Angle Measurements on Coal (Heterogeneous) Surfaces,” J. Coal Prep., 2000, vol. 21.