1. Gradual disc prolapse;Adams;Spine,1982
2. The epidemiology of spinal disorders;Andersson,1997
3. Lumbar Spine Syndromes;Andersson,1989
4. Lumbar Spinal Stenosis;Andersson,1992
5. The relation of spinal X-ray to low back pain and physical activity among 60-year-old men and women;Biering-Sorensen;Spine,1985