Altmann, S.; Spielmann, M.; Engel, F. A.; Ringhof, S.; Oriwol, D.; Härtel, S.; Neumann, R. Accuracy of Single Beam Timing Lights for Determining Velocities in a Flying 20-M Sprint: Does Timing Light Height Matter?. J. Hum. Sport Exerc. 2018, 13, 601-610.