Gerodimos Β., Stavropoulos Ν., Tsiokanos Α., and Katsareli Ε. “The Effect of Different Methods of Strength Evaluation in Hamstrings / Quadriceps Muscle Group Ratio”. Inquiries in Physical Education and Sport, vol. 3, no. 3, Dec. 2005, pp. 292-7, doi:10.26253/heal.uth.ojs.ispe.2005.1110.