http://www.max-mobility.com/Stroke_Pattern_Richter.pdf, http://www.max-mobility.com/Seat_Position.pdf, http://www.max-mobility.com/Optimal_Compliance_JRRD-05.pdf, http://www.max-mobility.com/FlexRim_EMG_Richter.pdf, http://www.max-mobility.com/Cross_Slope_Richter.pdf, http://www.max-mobility.com/Conference_Proceedings.pdf, http://www.max-mobility.com/OptiPush.pdf, http://www.max-mobility.com/PushOn.pdf, http://www.flexrim.com