RT Journal Article SR Electronic T1 N-methyl-D-aspartate (NMDA) antagonists in Parkinson's disease. JF Journal of Neurology, Neurosurgery & Psychiatry JO J Neurol Neurosurg Psychiatry FD BMJ Publishing Group Ltd SP 427 DO 10.1136/jnnp.56.4.427 VO 56 IS 4 A1 J Kornhuber A1 P Riederer YR 1993 UL http://jnnp.bmj.com/content/56/4/427.1.abstract AB