DystoniaNEJM 355:818-829, Tarsy,D. &Simon,D.K., 2006
Clinical Diagnosis of the DyskinesiasMed Clin of North Am 56:1321, Duvoisin,R., 1972
Diseases of the Extrapyramidal SystemDisease-a-month-Jan 1970., Klawans,H.,et al, 1970