1. Counter current column flotation machine;Moon,1982
2. Column flotation separation of high sulphur coal in a two inch pilot column,1982-1982
3. New developments in froth flotation in USA;Halvorsen;Aufbereitungs-Technik,1979
4. Coal froth separation;Otnelchenko,1982
5. Improvements in or relating to beneficiation of natural graphite;Chowdhury,1969