1. P. J. Guy and W. J. Trahar , inFlotation of Sulphide MineralsK. S. E Forssberg (ed) ; Elsevier , Amsterdam , pp. 91 – 110 ( 1985 ).
2. M. A. Eigeles and M. L. Volova ,in Proc. Vth IMPC. London , IMM pp. 271 – 28 ( 1960 ).
3. M. Rey and V. Frommanek ,in Proc. 5th IMPC. London , IMM pp. 343 – 353 ( 1960 )