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\bibitem{Leenaerts_etal2009} {\textquotedblleft}\textit{Adsorption of small molecules on graphene}{\textquotedblright}. Leenaerts O, Partoens B, Peeters FM, Microelectronics journal \textbf{40}, 860 (2009).   http://doi.org/10.1016/j.mejo.2008.11.022

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