Anticoagulation:Is There Still a Role in Atherothrombotic StrokeStroke 21:820-824, Estol,C.J.&Pessin,M.S., 1990
The Value of Carotid Endarterectomy in Treating Cerebral Ischemia of the Posterior CirculationNeurol 27:682, McNamara,J.O.,et al, 1977