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\bibitem{Skaltsas_etal2013} {\textquotedblleft}\textit{Ultrasonication induces oxygenated species and defects onto exfoliated graphene}{\textquotedblright}. Skaltsas T, Ke X, Bittencourt C, Tagmatarchis N, The journal of physical chemistry: C : nanomaterials and interfaces \textbf{117}, 23272 (2013).   http://doi.org/10.1021/jp4057048

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