1. The use of Sonicguide in infancy;Aitken;Journal of Visual Impairment and Blindness,1982
2. Low vision.;Apple,1980
3. Evaluation of man-machine systems in the mobility of the visually handicapped.;Armstrong,1975
4. Brain mechanisms in sensory substitution.;Bach-y-Rita,1972
5. Field expanders;Bailey;Optometric Monthly,1978