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\bibitem{Seyed-Talebi_etal2013} {\textquotedblleft}\textit{Doping effect on the adsorption of NH$_{3}$ molecule onto graphene quantum dot : from the physisorption to the chemisorption}{\textquotedblright}. Seyed-Talebi SM, Beheshtian J, Neek-Amal M, Journal of applied physics \textbf{114}, 124307 (2013).   http://doi.org/10.1063/1.4822165

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