Emerald dating through 40Ar/39Ar step-heating and laser spot analysis of syngenetic phlogopite Cheilletz, A. Féraud, G. /Giuliani, Gaston Ruffet, G. GEOCHIMIE GITOLOGIE DATATION ABSOLUE MINERALISATION METHODE D'ANALYSE EMERAUDE ARGON 1993 text https://www.documentation.ird.fr/hor/fdi:40533 fdi:40533 Cheilletz A., Féraud G., Giuliani Gaston, Ruffet G.. Emerald dating through 40Ar/39Ar step-heating and laser spot analysis of syngenetic phlogopite. 1993, 473-485 EN BRESIL BAHIA