Born, Philipp, Louis Malejka, Marius Behrens, Ralph Grambow, Dominik Meffert, Jonas Breuer, and Tobias Vogt. 2021. “Stroke Placement in women’s Professional Tennis: What’s After the Serve?”. International Journal of Racket Sports Science 3 (1), 37-44. https://journal.racketsportscience.org/index.php/ijrss/article/view/46.