RT Journal Article SR Electronic T1 Anatomical studies of the collateral blood supply to the brain and the retina JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 414 OP 417 DO 10.1136/jnnp.26.5.414 VO 26 IS 5 A1 Szapiro, J. A1 Pakula, H. YR 1963 UL http://jnnp.bmj.com/content/26/5/414.abstract AB