1. Couch, G.R., 1991, “Advanced Coal Cleaning Technology,” IEA Coal Research, pp. 13–15.
2. Diaz-Penafiel, P., and Dobby, G.S., 1994, “Kinetic studies in flotation columns: Bubble size effects,” Min. Eng., Vol. 7, No. 4, pp. 465–478.
3. Espinosa-Gomez, R., Finch, J.A., Yiannatos, J.B., and Dobby, G.S., 1988, “Flotation column carrying capacity: Particle size and density effects,” Minerals Engineering, Vol. 1, pp. 77–79.
4. Espinosa-Gomez, R., and Johnson, N.W., 1991, “Technical experiences with conventional columns at Mount Isa Mines Ltd.” Proc. Intern. Conf. on Column Flotation, Sudbury, Ontario, Canada, pp. 511–524.
5. Engelbrecht, J.A., and Woodburn, E.T., 1975, “The effects of froth height, aeration rate, and gas precipitation on flotation,” J. South African Inst. Min. Metal., Vol 75, pp. 125–132.