1. RU Patent 2 190 481, Byull. Izobret., 2002, no. 28.
2. Shubov, L.Ya., Ivankov, S.I., and Shcheglova N.C., Flotatsionnye reagenty v protsessah obogascheniya mineral’nogo syr’ya (Flotation Reagents in Benefication of Mineral Raw Materials), Moscow: Nedra, 1990, p. 5.
3. Dewar, M.J.S., Bull. Chim. Soc. Fr., 1951, vol. 18, p. C71.
4. Chatt, J. and Duncanson, L.A., J. Chem. Soc., 1953, p. 2939.
5. Geurts, P. and Van der Avoido, A., Surface Science, 1981, vol. 102, p. 185.