On a high-backdrivable direct-drive actuator for musculoskeletal bipedal robots. - Yasutaka Fujimoto; Yuuki Wakayama; Hiroko Omori; Issam A. Smadi (AMC, 2010)

On independent position/gap control of a spiral motor. - Issam A. Smadi; Hiroko Omori; Yasutaka Fujimoto (AMC, 2010)

Development, Analysis, and Experimental Realization of a Direct-Drive Helical Motor. - Issam A. Smadi; Hiroko Omori; Yasutaka Fujimoto (IEEE Trans. Ind. Electron., 2012)