Parkinson's DiseaseLancet 363:1783-1793, Samii,A.,et al, 2004
Parkinson's DiseaseNEJM 339:1044-1053,1130-1143, Lang,A.E.&Lozano,A.M., 1998
Eye Movements in Parkinsonian Syndromes:VidailhetM. , et al, Neurol 35:420-42694., , 1994