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Ferraro, Matteo; Stalder, Séverin; Baur, Heiner; Radlinger, Lorenz; Rogan, Slavko (2015). Evaluation of a foot switch system for the maximal instep kick in soccer-results from a single-case study Journal of Physical Education and Sport, 15(1), pp. 57-63. University of Pitesti 10.7752/jpes.2015.01010
