Design and control of an assistive exoskeleton with passive toe joint. - Ali Taherifar; Afshin Shariat; Reza Khezrian; Ahmad Zibafar; Amir Reza Rashidi; Hossain Rostami; Gholamreza Vossoughi; Ali Selk Ghafari (Int. J. Mechatronics Autom., 2018)