1. A.M. Gaudin, Flotation, 2nd edn. (Mc Graw-Hill Book Company Inc., New York, 1957), p. 232, 182, 285
2. Noda, ChemicalIndustry (Jaoan) 35 (1962-4)
3. K.L. Sutherland, I.W. Wark, Principles of Flotation (Australian Institute of Mining and Metallurgy (INC), Melbourne, 1955), p. 84, 98, 278, 302, 319
4. Japan Patent: 73-3043
5. G. Song, Flotation (Japan) 55, 7 (1975)