Guerra-Sommer, Margot, Cazzulo-Klepzig, Miriam, Laquintinie Formoso, Milton Luiz, Menegat, Rualdo, Mendonça Fo, João Graciano (2008) U–Pb dating of tonstein layers from a coal succession of the southern Paraná Basin (Brazil): A new geochronological approach. Gondwana Research, 14 (3) 474-482 doi:10.1016/j.gr.2008.03.003

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