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\bibitem{Bussmann-Holder+Michel1998} {\textquotedblleft}\textit{Bond geometry and phase transition mechanism of H-bonded ferroelectricity}{\textquotedblright}. Bussmann-Holder A, Michel KH, Physical review letters \textbf{80}, 2173 (1998).   http://doi.org/10.1103/PhysRevLett.80.2173

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