Hagner-Derengowska, M., M. Dylewski, J. Dawidziuk, and W. Hagner. “Changeability of Spatial and Temporal Gait Parameters Measured on a Treadmill With the Use of a 3d Ultrasound-Based Movement Measuring System”. Medical and Biological Sciences, vol. 26, no. 2, June 2012, pp. 19-23, doi:10.12775/4051.