1MacNab I. Negative disc exploration: an analysis of the cause of nerve - root: involvement in sixty-eight patients [ J ]. Bone Joint Surg, 1971,53 : 891.
6MACNAB I. Negative disc explorration. An analysis of the cause of nerve-root involvement in sixty-eight patient[J]. J Bone Joint Surg(Am), 1971,53(5):891- 903.