1. Gradual disc prolapse;Adams;Spine,1985
2. Andersson, G.B., Pope, M.H., Frymoyer, J.W., 1984. Epidemiology. In: Pope, M.H., Frymoyer, J.W., Andersson, G.B. (Eds.), Occupational Low Back Pain. Praeger, New York.
3. Epidemiological aspects of back pain in the nursing profession;Buckle;Int. J. Nursing Stud.,1987
4. Incidence, prevalence, and variables associated with low back pain in staff nurses;Cato;AAOHN J.,1989
5. Occupational Biomechanics;Chaffin,1991