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\bibitem{Villarreal_etal2021} {\textquotedblleft}\textit{Breakdown of universal scaling for nanometer-sized bubbles in graphene}{\textquotedblright}. Villarreal R, Lin P-C, Faraji F, Hassani N, Bana H, Zarkua Z, Nair MN, Tsai H-C, Auge M, Junge F, Hofsaess HC, De Gendt S, De Feyter S, Brems S, Ahlgren EH, Neyts EC, Covaci L, Peeters FM, Neek-Amal M, Pereira LMC, Nano Letters \textbf{21}, 8103 (2021).   http://doi.org/10.1021/ACS.NANOLETT.1C02470

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