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^ abcdde Haas, Denis (30 May 2021). "Titel sammeln" [Collect titles]. Welt am Sonntag (in German). Berlin. p. 4.
^Stroß, Peter (14 December 2018). "Zwischen Büffeln und Boxring" [Between swotting and boxing ring]. koelnsport.de (in German). Archived from the original on 23 October 2020. Retrieved 9 June 2021.