Mourtzios , Christos, Eleftherios Kellis, and Konstantinos Salonikidis. 2019. “Plantar Pressures Differences Between the Flat, Slice and Topspin Serves”. ITF Coaching & Sport Science Review 27 (78). London, U.K.:32-34. https://doi.org/10.52383/itfcoaching.v27i78.92.