Zabihi, Saeedeh, Shirazinejad, Rahim , Torkfar, Ahmad, Hosseini , Seyed Ali , Moghadasi, Mehrzad. The Relationship between Physical Fitness and Cardiac Waves in Volleyball Referees.  Journal of Sports Physiology and Athletic Conditioning. 2025;5(16):-. doi:10.61882/jspac.50856.5.16.