(1)
Zafeiriou Π.; Christoforidis Χ.; Kampas Α.; Douroudos Ι.; Taxildaris Κ. Comparison of Exercise Programs With and Without the Use of the Ball for the Improvement of the Maximum Speed, the Speed Endurance and the Countermovement Jump in Young Football Players 14-15 Years Old. ispe 2007, 5, 424-430.