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\bibitem{Li_etal2015} {\textquotedblleft}\textit{Mechanical switching of nanoscale multiferroic phase boundaries}{\textquotedblright}.  Li YJ, Wang JJ, Ye JC, Ke XX, Gou GY, Wei Y, Xue F, Wang J, Wang CS, Peng RC, Deng XL, Yang Y, Ren XB, Chen LQ, Nan CW, Zhang JX;, Advanced functional materials \textbf{25}, 3405 (2015).   http://doi.org/10.1002/adfm.201500600

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