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1.- PRELIMINARY SEM AND EPMA INVESTIGATIONS ON KTB SPHERULES FROM THE PERNAMBUCO AREA (NORTHEASTERN BRAZIL); DIAGENETIC APATITE AND FLUORITE CONCRETIONS, SUSPECTED FLUORINE ANOMALIES
AKADEMIAI KIADO; BUDAPEST; HUN; HUNGARY, 2000
TERRESTRIAL AND COSMIC SPHERULES; PROCEEDINGS OF THE 1998 ANNUAL MEETING TECOS
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2.- THE K-T BOUNDARY IN BRAZILIAN MARGINAL SEDIMENTARY BASINS AND RELATED SPHERULES
GEOCHEMICAL SOCIETY OF JAPAN; NAGOYA; JPN; JAPAN, 2004
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