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\bibitem{Li_etal2013} {\textquotedblleft}\textit{Polar and magnetic Mn$_{2}$FeMO$_{6}$ (M=Nb, Ta) with LiNbO$_{3}$-type structure : high-pressure synthesis}{\textquotedblright}.  Li MR, Walker D, Retuerto M, Sarkar T, Hadermann J, Stephens PW, Croft M, Ignatov A, Grams CP, Hemberger J, Nowik I, Halasyamani PS, Tran TT, Mukherjee S, Dasgupta TS, Greenblatt M;, Angewandte Chemie: international edition in English \textbf{52}, 8406 (2013).   http://doi.org/10.1002/anie.201302775

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