File:Soccerball U.S..png

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File:Flag of Portugal with football.png

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File:Algebraische Kurven (Osnabrück 2017-2018)Vorlesung28.pdf

Abbildungsverzeichnis Quelle = Soccerball.svg , Autor = Benutzer Ranveig auf Commons, Lizenz = PD Quelle = Torus illustration.png , Autor = Oleg Alexandrov