1. Postural load and the incidence of musculoskeletal illness;Aars,1990
2. Concepts in prevention;Andersson,1991
3. The epidemiology of spinal disorders in industry;Andersson,1991
4. Occupational biomechanics of the lumbar spine;Andersson,1991
5. Determining permissible lifting loads: an approach;Ayoub,1991