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2. Lumbar Disc Lesions, 3rd edition;Armstrong,1965
3. Herniated upper lumbar discs;Aronson;Journal of Bone and Joint Surgery,1963
4. Radiology of lumbar spinal stenosis;Baddeley,1976
5. The role of abdominal pressure in relieving the pressure on the lumbar intervertebral discs;Bartelink;Journal of Bone and Joint Surgery,1957