Alexander W. Boehler Kevin W. Hollander Thomas Sugar Dosun Shin Design, implementation and test results of a robust control method for a powered ankle foot orthosis (AFO). 2025-2030 2008 ICRA https://doi.org/10.1109/ROBOT.2008.4543504 conf/icra/2008 db/conf/icra/icra2008.html#BoehlerHSS08