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Nagel, Siegfried; Schlesinger, Torsten (2017). Development and voluntarism in soccer clubs. In: Bangsbo, Jens; Krustrup, Peter; Hansen, Peter Riis; Ottesen, Laila; Pfister, Gertrud; Elbe, Anne-Marie (eds.) Science and Football VIII - The Proceedings of the Eighth World Congress on Science and Football (pp. 139-148). London and New York: Routledge
