1. Birkmayer, W., Riederer, P.: Biochemistry. In: Parkinson’s Disease, pp. 6–45. Springer Vienna, Vienna (1983)
2. Andrade, A.O., et al.: Sinais e sintomas motores da doença de Parkinson: caracterização, tratamento e quantificação. Novas tecnologias aplicadas à saúde: integração de áreas transformando a sociedade, p. 282. EDUERN, Mossoró (2017)
3. Jankovic, J.: Parkinson’s disease: clinical features and diagnosis. J. Neurol. Neurosurg. Psychiatry 79(4), 368–376 (2008)
4. Goetz, C.G., et al.: Movement disorder society-sponsored revision of the unified Parkinson’s disease rating scale (MDS-UPDRS): scale presentation and clinimetric testing results. Mov. Disord. 23(15), 2129–2170 (2008)
5. Hallett, M.: Overview of human tremor physiology. Mov. Disord. 13(S3), 43–48 (2008)