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1.- Luminescence spectroscopic study of Cr (super 3+) in Brazilian topazes from Ouro Preto
Springer-Verlag; Berlin - New York; III; International, 2006
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2.- OPTICAL SPECTROSCOPY STUDY OF VARIOUSLY COLORED GEM-QUALITY TOPAZES FROM OURO PRETO, MINAS GERAIS, BRAZIL
SPRINGER-VERLAG; BERLIN-NEW YORK; DEU; FEDERAL REPUBLIC OF GERMANY, 2003
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