Kazakas Παναγιώτης, Gantiraga Ευαγγελία, and Papadopoulos Χρήστος. 2006. “The Effect of Two Different Methods of Feedback in Qualitative and Quantitative Characteristics of Forehand Clear Service in Badminton”. Inquiries in Physical Education and Sport 4 (3):390-98. https://doi.org/10.26253/heal.uth.ojs.ispe.2006.1152.