1. Vision substitution by tactile image projection;P Bach-y-Rita,1969
2. Vibrotactile letter recognition: The effects of a masking stimulus;JC Craig,1976
3. Cutaneous coding of optical signals: The optohapt;FA Geldard,1966
4. A direct translation reading aid for the blind;JG Linvill,1966
5. Wearable obstacle avoidance electronic travel aids for blind: A survey;D Dakopoulos