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\bibitem{Ghorbanfekr-Kalashami_etal2017} {\textquotedblleft}\textit{Dependence of the shape of graphene nanobubbles on trapped substance}{\textquotedblright}. Ghorbanfekr-Kalashami H, Vasu KS, Nair RR, Peeters FM, Neek-Amal M, Nature communications \textbf{8}, 15844 (2017).   http://doi.org/10.1038/ncomms15844

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