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\bibitem{Li_etal2012} {\textquotedblleft}\textit{A polar corundum oxide displaying weak ferromagnetism at room temperature}{\textquotedblright}.  Li MR, Adem U, McMitchell SRC, Xu Z, Thomas CI, Warren JE, Giap DV, Niu H, Wan X, Palgrave RG, Schiffmann F, Cora F, Slater B, Burnett TL, Cain MG, Abakumov AM, Van Tendeloo G, Thomas MF, Rosseinsky MJ, Claridge JB;, Journal of the American Chemical Society \textbf{134}, 3737 (2012).   http://doi.org/10.1021/ja208395z

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