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Robbins, T. W. and James, M. and Owen, A. M. and Lange, Klaus W. and Lees, A. J. and Leigh, P. N. and Marsden, C. D. and Quinn, N. P. and Summers, B. A. (1994) Cognitive deficits in progressive supranuclear palsy, Parkinson's disease, and multiple system atrophy in tests sensitive to frontal lobe dysfunction. Journal of neurology, neurosurgery, and psychiatry 57 (1), pp. 79-88.