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\bibitem{Zielinski+Michel1992} {\textquotedblleft}\textit{Microscopic model of surfaces in orientationally disordered ionic crystals : the (001) surface of KCN}{\textquotedblright}. Zieli{\'n}ski P, Michel KH, Physical review : B : condensed matter and materials physics \textbf{46}, 4806 (1992).   http://doi.org/10.1103/PhysRevB.46.4806

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