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Drust, B. Julkaisussa 7th World Congress on Science and Football (WCSF), 2011 (2011)
Gill, N. Julkaisussa 7th World Congress on Science and Football (WCSF), 2011 (2011)
Conzelmann, A. Julkaistu 2007
Davis, P. Julkaistu 2004
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