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  Kramm, U.I.; Zehl, G.; Zizak, I.; Herrmann, I.; Dorbandt, I.; Bogdanoff, P.; Fiechter, S.: In-situ X-Ray Diffraction Study of the Influence of Sulphur on Phase Formation during the Heat-Treatment of Porphyrin-based Oxygen Reduction Catalysts. , 2009