Citation: Le\'on-Reina, L; Porras-V\'azquez, J M; Losilla, E. R.; Sheptyakov, D. V.; Llobet, A.; Aranda, M. A. G. (2007). Low temperature crystal structures of apatite oxygen-conductors containing interstitial oxygen.. Dalton transactions (Cambridge, England : 2003), , pp. 2058-2064.