RT Journal Article SR Electronic T1 Urea and spinal cord trauma JF Neurology JO Neurology FD Lippincott Williams & Wilkins SP 69 OP 69 DO 10.1212/WNL.13.1.69 VO 13 IS 1 A1 J. Joyner A1 L. W. Freeman YR 1963 UL http://n.neurology.org/content/13/1/69.abstract AB