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1.- Gemstones from Cuba Zwaan, P.C.; Congreso - International Gemmological Conference (21. 1987. Brasil) [S.l.: s.n.], 1987 Transactions of the XXI International Gemmological Conference: Brazil 1987 = XXI Conferencia Internacional de Gemologia: Brasil 1987: Technical sessions: September 21-25, 1987 C 334-19 Ver registro
2.- Observations on gemstones and their source rocks from Sri Lanka Arps, Charles E.S.; Congreso - International Gemmological Conference (21. 1987. Brasil) [S.l.: s.n.], 1987 Transactions of the XXI International Gemmological Conference: Brazil 1987 = XXI Conferencia Internacional de Gemologia: Brasil 1987: Technical sessions: September 21-25, 1987 C 334-18 Ver registro
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