1. Guidelines to the Evaluation of Permanent Impairment;American Medical Association Committee on Rating of Mental and Physical Impairment,1971
2. Reliability and reproducibility of clinical findings in low-back pain;Nelson;Spine,1979
3. Rheumatologic Interviewing and Physical Examination of the Joints;Polley,1978
4. Physical Examination of the Spine and Extremities;Hoppenfeld,1976
5. Ankylosing spondylosis: measurement of hip and spine movements;Dunham;Br J Phys Med,1949