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\bibitem{Abakumov_etal2006} {\textquotedblleft}\textit{Crystallographic shear structures as a route to anion-deficient perovskites}{\textquotedblright}. Abakumov AM, Hadermann J, Bals S, Nikolaev IV, Antipov EV, Van Tendeloo G, Angewandte Chemie: international edition in English \textbf{45}, 6697 (2006).   http://doi.org/10.1002/anie.200602480

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