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\bibitem{He_etal2013} {\textquotedblleft}\textit{90{\textdegree} Rotation of orbital stripes in bilayer manganite PrCa$_{2}$Mn$_{2}$O$_{7}$ studied by in situ transmission electron microscopy}{\textquotedblright}. He ZB, Deng G, Tian H, Xu Q, Van Tendeloo G, Journal of solid state chemistry \textbf{200}, 287 (2013).   http://doi.org/10.1016/j.jssc.2013.01.051

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