1. Aplan, F.F., 1977. Use of the flotation process for desulfurization of coal. In: Wheelock, T.D. (Ed.), Coal Desulfurization. ACS Symposium Series, No. 64, Washington, DC, pp. 70–82.
2. Arnold, B.J., Aplan, F.F., 1986. Coal froth flotation: the response of coal and mineral particles to reagent and circuit variations. In: Somasundaran, P. (Ed.), Advances in Mineral Processing. SME, Littleton, CO, pp. 351–365.
3. The effect of clay on coal flotation;Arnold;International Journal of Mineral Processing,1987
4. Froth flotation of minus 48-mesh bituminous coal slurries;Davis;Trans. AIME,1948
5. Ellington, J.T., 1998. Beneficiation Technologies. Personal communication.