Daveler, B., Wang, H., Gebrosky, B., Grindle, G., Schneider, U., & Cooper, R. (1969). Integration of Pneumatic Technology in Powered Mobility Devices. Topics in Spinal Cord Injury Rehabilitation, 23(2), 120-130. https://doi.org/10.1310/sci2302-120 (Original work published 1969)