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\bibitem{Mabesoone_etal1985} {\textquotedblleft}\textit{Parnaiba Basin shales (Northeast Brazil)}{\textquotedblright}. Mabesoone JM, Farias CC, Van Grieken R, Duarte PJ, Delgado A, Freira EMP, Anais da Academia Brasileira de Ci{\^e}ncias \textbf{57}, 481 (1985)

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