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University of Gottingen

University Frankfurt

University of Wuppertal

German Sport University Cologne Deutsche Sporthochschule Köln

Max Planck Digital Library

Aachen University of Applied Sciences Fachhochschule Aachen

Niederrhein University of Applied Sciences Hochschule Niederrhein

SLUB Dresden

University of Rostock

Nuremberg Institute of Technology Technische Hochschule Nürnberg