Cescon, C., A. Tettamanti, M. Barbero, and R. Gatti. “Finite Helical Axis for the Analysis of Joint Kinematics: Comparison of an Electromagnetic and an Optical Motion Capture System”. Archives of Physiotherapy, vol. 5, no. 1, Aug. 2015, doi:10.1186/s40945-015-0008-7.