G. M. Stern

Motor response to levodopa in patients with parkinsonian motor fluctuations: a follow-up study over three years.

P. Kempster, A. Lees, A. Hughes, 1994, Journal of neurology, neurosurgery, and psychiatry.

Asymmetry of substantia nigra neuronal loss in Parkinson's disease and its relevance to the mechanism of levodopa related motor fluctuations.

A J Lees, G M Stern, W. Gibb, 1989, Journal of neurology, neurosurgery, and psychiatry.