By Merkle R.K.W.   Pikl R.   Verryn S.M.C.   Waal D. de   in Mineralogical Magazine

ISSN:1471-8022|63|3|363-363

Mineralogical Society‎(1999)‎

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By de Villiers J.P.R.   Verryn S.M.C.   Fernandes M.A.   in Mineral Processing and Extractive Metallurgy

ISSN:0371-9553|113|2|66-74

Maney Publishing‎(2004)‎

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By Pikl R.   Waal D. De   Merkle R. K. W.   Verryn S. M. C.   in Applied Spectroscopy

ISSN:0003-7028|53|8|927-930

Society for Applied Spectroscopy‎(1999)‎

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