Eye Movements in Parkinsonian Syndromes:Vidailhet
M. , et al, Neurol 35:420-42694., , 1994
Diagnostic Criteria for Parkinson Disease
Arch Neurol 56:33-39, Gelb,D.J.,et al, 1999
Parkinsonism-Recognition and Differential Diagnosis
BMJ 310:447-452, Quinn,N., 1995