Trikalis Χρήστος, Papanikolaou Ζήσης, Soulas Δημήτριος, and Gerodimos Βασίλειος. 2007. “Evaluation of the Speed and Aerobic Capacity of Elite Greek Soccer Referees in A΄ and B΄ National Division”. Inquiries in Physical Education and Sport 5 (3):445-50. https://doi.org/10.26253/heal.uth.ojs.ispe.2007.1224.