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\bibitem{Nihoul_etal1998} {\textquotedblleft}\textit{Layered structures accomodating stoichiometry in M2X2O7 systems, as seen by diffraction and HREM}{\textquotedblright}. Nihoul G, Leroux C, Cesari C, Van Tendeloo G, Electron microscopy: vol. 2 , 295 (1998)

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