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Caignaert, V., Hervieu, M., Nguyen, N., & Raveau, B. (1986). The oxygen defect perovskite Sr2Mn2O5: HREM study. Journal of Solid State Chemistry, 62(3), 281–289. doi:10.1016/0022-4596(86)90242-2 
10.1016/0022-4596(86)90242-2