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An. Christensen et al., SUPERCONDUCTING CUPRATES AND RELATED OXIDES .9. IN-SITU SYNCHROTRON X-RAY-POWDER DIFFRACTION INVESTIGATION OF THE OXIDATION AND REDUCTION OF YBA2CU3O7-DELTA IN A FLOW OF OXYGEN OR OF NITROGEN GAS IN THE TEMPERATURE-RANGE 400-725-DEGREES-C, Acta chemica Scandinavica, 51(3), 1997, pp. 340-342