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Champions League: Borussia Dortmund undone by Mats Hummels red card | Sports | German football and major international sports news | DW | 03.11.2021
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Bayern Munich sign Dortmund captain Mats Hummels | Sports | German football and major international sports news | DW | 10.05.2016
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Opinion: Potential rewards outweigh risks in Mats Hummels′ Borussia Dortmund deal | Opinion | DW | 19.06.2019
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Off the Crossbar: Cologne Alone — Borussia Dortmund's Mats Hummels gone and forgotten - Bavarian Football Works
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