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\bibitem{Schoelz_etal2015} {\textquotedblleft}\textit{Graphene ripples as a realization of a two-dimensional Ising model : a scanning tunneling microscope study}{\textquotedblright}. Schoelz JK, Xu P, Meunier V, Kumar P, Neek-Amal M, Thibado PM, Peeters FM, Physical review: B: condensed matter and materials physics \textbf{91}, 045413 (2015).   http://doi.org/10.1103/PhysRevB.91.045413

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