Monitoring external and internal loads of Brazilian soccer referees during official matches - Costa, E. C.; Vieira, C. M. A.; Moreira, A.; Ugrinowitsch, C.; Castagna, C.; Aoki, M. S. (Journal of Sports Science & Medicine, 2013)
Keywords: soccer; referee; load; competition; running; heart rate; heart; frequency; Turkey; sport games; biological and medical sciences