Aarsland, D. et al. 'Frequency of dementia in Parkinson disease'. Archives of Neurology, 53, 538–42 (1996); см. также Calne, D. B. et al. Alzheimer's disease, Parkinson's disease and motorneurone disease: abiotrophic interaction between ageing and environment? Lancet, 2, 1067–70 (1986); Horvath, J. et al. 'Neuropathology of Parkinsonism in patients with pure Alzheimer's disease'. Journal of Alzheimer's Disease, 39, 115–20 (2014).