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\bibitem{Ao_etal2012} {\textquotedblleft}\textit{The electric field as a novel switch for uptake/release of hydrogen for storage in nitrogen doped graphene}{\textquotedblright}. Ao ZM, Hern{\'a}ndez-Nieves AD, Peeters FM, Li S, Physical chemistry, chemical physics \textbf{14}, 1463 (2012).   http://doi.org/10.1039/c1cp23153g

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