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\bibitem{Lamoen+Persson1998} {\textquotedblleft}\textit{Adsorption of potassium and oxygen on graphite: a theoretical study}{\textquotedblright}. Lamoen D, Persson BNJ, Journal Of Chemical Physics \textbf{108}, 3332 (1998).   http://doi.org/10.1063/1.475732

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