The CLEF-2021 CheckThat! Lab on Detecting Check-Worthy Claims, Previously Fact-Checked Claims, and Fake News.

Preslav Nakov, Giovanni Da San Martino, Tamer Elsayed, Alberto Barrn-Cedeo, Rubn Mguez, Shaden Shaar, Firoj Alam, Fatima Haouari, Maram Hasanain, Nikolay Babulkov, Alex Nikolov, Gautam Kishore Shahi, Julia Maria Stru, Thomas Mandl

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