Zalavras Αθανάσιος, Soulas Δημήτριος, Voutselas Βασίλειος, Kritikos Αλέξανδρος, and Daskalakis Στέλιος. 2007. “The Effects of Two Different Methods of Interval Training on Maximal Oxygen Uptake”. Inquiries in Physical Education and Sport 5 (1):134-42. https://journals.lib.uth.gr/index.php/inquiries/article/view/1189.