"Salt and Pepper" in the Eye and Face: A Prelude to Brainstem IschemiaAm J Ophthalmol 144:322-325, Conforto, A.B.,et al, 2007
Basilar Artery Stenosis:Middle & Distal SegmentsNeurol 37:1742-1746, Pessin,M.S.,et al, 1987