9Walk D,Fisher MA,Dotmdoulakis SH.et al .Somatosensory evoked potentials in the evaluation Of lumbosacral radiculopathy.Neurololgy[J] 1992, 42: 1197-1202.
10Bates D Ruggeri P Imaging modalities for evakmtion Of the spine. Radial Clin North Am[J] 1991.29:675-678.