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2. Potassium-argon ages of alkaline rocks from Southern Brazil;Amaral G.;Geochimica et Cosmochimica Acta,1967
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4. Alkaline magmatism in Central-Eastern Paraguay: relationships with coeval magmatism in Brazil;Berrocal J.,1996
5. Mesozoischer und Kanozoischer anorogener magmatismus in Ostparaguay: arbeiten zur geologie und petrologie zweier alkaliprovinzen;Bitschene P.R.,1987