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\bibitem{Bussmann-Holder+Michel1998} {\textquotedblleft}\textit{Proton tunneling and nonlinear polarizability effects in hydrogen-bonded ferroelectrics}{\textquotedblright}. Bussmann-Holder A, Michel KH, AIP conference proceedings
T2 -- 5th Williamsburg Workshop on 1st-Principles Calculations for, Ferroelectrics, FEB 01-04, 1998, WILLIAMSBURG, VA , 202 (1998)

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