1. The flotation of apatite and dolomite in ortho phosphate solution;Johnston;Trans. I.M.M.,1978
2. New techniques in beneficiation of phosphate rock;Lawver;Trans. SME-AIME,1980
3. Beneficiation of dolomitic Florida phosphate reserves;Lawver,1982
4. Beneficiation of high magnesium phosphate from South Florida;Llewellyn;U.S. Bureau of Mines, RI 8609,1982
5. Characterization of low grade rock phosphates and their beneficiation for fertilizer industry;Lodha;Fert. Technol.,1982