Neurophysiological basis of normal and abnormal motor activities, edited by Melvin D. Yahr and Dominick P. Purpura; proceedings of the third symposium of the Parkinson's Disease Information and Research Center of Columbia University, November 28th and 29th, 1966. - Purpura, Dominick P., 1927-; Yahr, Melvin D. (Melvin David), 1917- (Raven Press, 1967)