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\bibitem{He_etal2013} {\textquotedblleft}\textit{Microstructure of bilayer manganite PrCa$_{2}$Mn$_{2}$O$_{7}$ showing charge/orbital ordering}{\textquotedblright}. He Z, Tian H, Deng G, Xu Q, Van Tendeloo G, Applied physics letters \textbf{102}, 212902 (2013).   http://doi.org/10.1063/1.4807758

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