G. Adamson, S. Murphy, and D. Stubbs. Pain, In Press, Corrected Proof, (6 December 2006)urlhttp://www.sciencedirect.com/science/article/B6T0K-4MH8BNM-5/2/bbbc596802f8c78b41587cf139389c23.
C. Cook, R. Burgess-Limerick, and S. Papalia. International Journal of Industrial Ergonomics, 33 (5):
463--472(May 2004)http://www.sciencedirect.com/science/article/B6V31-4BVPW2H-1/2/8a7fcf14dbae8ac1659bac4364c2516e.
C. Cook, and K. Kothiyal. Applied Ergonomics, 29 (6):
439--443(December 1998)http:/www.sciencedirect.com/science/article/B6V1W-3V45PN8-5/2/4a9d3bc4b52d6b5c7376e7a3846aea1e.