Degenerative Diseases of the Nervous System, Parkinson Disease
Adams & Victors Principles of Neurology, Chp 39, pg 1082, Ropper, A.H.,et al, 2014
Invited Article: Changing Concepts in Parkinson Disease: Moving Beyond the Decade of the Brain
Neurol 70:1996-2003, Marras,C. &Lang,A., 2008