V. Socha, P. Kutilek, O. Cakrt, and R. Cerny, “COMPARATIVE MEASUREMENTS OF HEAD ANGULAR MOVEMENTS USING A CAMERA SYSTEM AND A GYROSCOPE SYSTEM”, Acta Polytech, vol. 54, no. 4, pp. 295–300, Aug. 2014, doi: 10.14311/AP.2014.54.0295.