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Polish Journal of Sport and Tourism > 2014 > 21 > 3 > 178-183
Polish Journal of Sport and Tourism > 2015 > 21 > 3 > 178-183
Polish Journal of Sport and Tourism > 2014 > 21 > 3 > 178-183
Polish Journal of Sport and Tourism > 2015 > 21 > 3 > 178-183