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\bibitem{Lebrini_etal2011} Lebrini, M., Robert, F., \& Roos, C. (2011). Alkaloids Extract from Palicourea guianensis Plant as Corrosion Inhibitor for C38 Steel in 1 M Hydrochloric Acid Medium. \textit{Int. J. Electrochem. Sci.}, \textit{6}(3), 847--859.

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