Chronic Cervical Cord Compression:Clinical Significance of Increased Signal Intensity on MR Images
Radiology 173:219-224, Takahashi,M.,et al, 1989
Spinal Cord Injury, Spinal Fracture, & Spinal Stenosis in Ankylosing Spondylitis
J Neurosurg 57:609-616, Weinstein,P.R.,et al, 1982