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Ozonbulletin des Deutschen Wetterdienstes : (04/05/2005) Issue 104. Ungewöhnliche kalte Stratosphäre verursacht starke Ozonverluste im arktischen Winter 2004/2005 / Meteorologisches Observatorium Hohenpeissenberg. Offenbach am Main. / CC-BY-License (4.0)