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\bibitem{Esfahani_etal2013} {\textquotedblleft}\textit{Field effect on surface states in a doped Mott-insulator thin film}{\textquotedblright}. Esfahani DN, Covaci L, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{87}, 035131 (2013).   http://doi.org/10.1103/PhysRevB.87.035131

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