1. New Methods of Computing the Washabilities of Coals;Tromp;Glukauf,1937
2. New Methods of Computing the Washabilities of Coals;Tromp;Colliery Guardian,1937
3. New Methods of Computing the Washabilities of Coals;Tromp;Colliery Guardian,1937
4. Generalized Distribution Curve for Characterizing the Performance of Coal-Cleaning Equipment;Gottfried;U.S. Bureau of Mines Report of Investigations,1977
5. Analysis of Mineral Separation Processes;Prosser,1969