Evaluation of Extracranial Vertebral Artery Dissection with Duplex Color-Flow Imaging
Stroke 27:290-295, Bartels,E.&Flugel,K.A., 1996
Transcranial Doppler Correlation with Angiography in Detection of Intracranial Stenosis
Stroke 25:1931-1934, Rorick,M.B.,et al, 1994