1. Congruency in medical and self-assessment of disability;Nagi;Indust Med Surg,1969
2. Health Interview Responses Compared with Medical Records;National Center for Health Statistics,1965
3. Interview Data for Chronic Conditions Compared with Information Derived from Medical Records;National Center for Health Statistics,1967
4. Low back pain;Ward;J R Coll Gen Practit,1968
5. Investigation of the relation between low back pain and occupation;Magora;Indust Med,1970