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\bibitem{Abdullah_etal2018} {\textquotedblleft}\textit{Confined states in graphene quantum blisters}{\textquotedblright}. Abdullah HM, Bahlouli H, Peeters FM, Van Duppen B, Journal of physics : condensed matter \textbf{30}, 385301 (2018).   http://doi.org/10.1088/1361-648X/AAD9C7

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