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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.
Owen, A. M. and James, M. and Leigh, P. N. and Summers, B. A. and Marsden, C. D. and Quinn, N. P. and Lange, Klaus W. and Robbins, T. W. (1992) Fronto-striatal cognitive deficits at different stages of Parkinson's disease. Brain : a journal of neurology 115 ( Pt 6, pp. 1727-1751.