Evoked potentials, reaction time and cognitive performance in on and off phases of Parkinson's disease.
J Neurol Neurosurg Psychiatry. 1989 Mar;52(3):338-40. doi: 10.1136/jnnp.52.3.338.
J Neurol Neurosurg Psychiatry. 1989.
PMID: 2926417
Free PMC article.