1. Cats-Baril W. The cost of low back pain. Travelers Insurance Low Back Symposium, St. Louis, 1996.
2. Identifying patients at risk of becoming disabled because of back pain: the Vermont rehabilitation engineering center predictive model;Cats-Baril;Spine,1991
3. Survey of occupational injuries and illnesses, 1996;United States Bureau of Labor Statistics,1998
4. United States Bureau of Labor Statistics. BLS Issues 1996 Lost-work-time injuries and illnesses survey. American College of Occupational and Environmental Medicine Report 1998; 98–5:6–7.
5. The effects of limitation of activity upon the human body;Kottke;JAMA,1966