1. Pain Suppression by Transcutaneous Electronic Stimulation
2. Cobbold, R.S.C. Transducers for Biomedical Measurement: Principles and Applications. New York: John Wiley and Sons, 1974.
3. Transcutaneous Neural Stimulation for Relief of Pain
4. Testing of electrical transcutaneous stimulators for suppressing pain;Mason C.P.;Bull Prosthetics Research,1976
5. Report on the Findings and Recommendations on Transcutaneous Electrical Nerve Stimulation for Pain Relief Panel on Review of Neurological Devices Food and Drug Administration February 1976. (Available from National Technical Information Service www.NTIS.gov)