Denegar, C. R., & Perrin, D. H. (1992). Effect of transcutaneous electrical nerve stimulation, cold, and a combination treatment on pain, decreased range of motion, and strength loss associated with delayed onset muscle soreness. Journal of athletic training, 27(3), S. 200-206. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1317247/pdf/jathtrain00035-0010.pdf

Denegar, Craig R., and David H. Perrin. "Effect of Transcutaneous Electrical Nerve Stimulation, Cold, and a Combination Treatment On Pain, Decreased Range of Motion, and Strength Loss Associated With Delayed Onset Muscle Soreness." Journal of Athletic Training 27, no. 3 (1992): S. 200-206.

Denegar, Craig R., and David H. Perrin. "Effect of Transcutaneous Electrical Nerve Stimulation, Cold, and a Combination Treatment On Pain, Decreased Range of Motion, and Strength Loss Associated With Delayed Onset Muscle Soreness." Journal of Athletic Training 27.3 (1992): S. 200-206.