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"Eisen mit langem Atem" [Iron with staying power]. scienceticker (in German). 27 August 2009. Archived from the original on 3 February 2018. Retrieved 22 May 2010.
"Eisen mit langem Atem" [Iron with staying power]. scienceticker (in German). 27 August 2009. Archived from the original on 3 February 2018. Retrieved 22 May 2010.