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\bibitem{Dubourdieu_etal2007} {\textquotedblleft}\textit{Thin films and superlattices of multiferroic hexagonal rare earth manganites}{\textquotedblright}. Dubourdieu C, Huot G, Gelard I, Roussel H, Lebedev OI, Van Tendeloo G, Philosophical magazine letters \textbf{87}, 203 (2007).   http://doi.org/10.1080/09500830601137173

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