1. Use of the flotation process for desulfurization of coal;Aplan,1977
2. Froth flotation to desulfurize coal;Miller,1982
3. Coal preparation and cleaning;Wheelock,1984
4. Separation of coal/pyrite mixtures by agglomeration with heptane;Fan,1990
5. J. Drzymala and T.D. Wheelock, Effect of oxidation on separation of coal and pyrite by selective oil agglomeration, presented at AIChE Summer National Meeting, Minneapolis, MN, August 9–12, 1992.