Zafiriadis Στέφανος, Loupos Δημήτρης, Valkoumas Ιωάννης, and Tsalis Γιώργος. 2007. “The Effect of Backstroke Swimming Using “Paddles” and ‘Swim Chute’ in Stroke Parameters and in the Concentration of Lactic Acid”. Inquiries in Physical Education and Sport 5 (3):437-44. https://doi.org/10.26253/heal.uth.ojs.ispe.2007.1223.