"Top of the Basilar"SyndromeNeurol 30:72-79, 1980, Caplan,L.R., 1980
Parkinson's DiseaseIn Handbk of Clinical Neurology, Vinken, P. J. & Bruyn, G. W. , Ed, North-Holland Publ Co, Amsterdam, 6:173, 1968. Selby, G., 1968