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\bibitem{Quintana_etal2012} {\textquotedblleft}\textit{Production of large graphene sheets by exfoliation of graphite under high power ultrasound in the presence of tiopronin}{\textquotedblright}. Quintana M, Grzelczak M, Spyrou K, Kooi B, Bals S, Van Tendeloo G, Rudolf P, Prato M, Chemical communications \textbf{48}, 12159 (2012).   http://doi.org/10.1039/c2cc35298b

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