1. Basal ganglia gait disorders;Brown,1996
2. An assay on the Shaking Palsy;Parkinson,1817
3. Members of the UPDRS development committee. Unified Parkinson's Disease Rating Scale;Fahn,1987
4. Parkinsonism: onset, progression, and mortality;Hoehn;Neurology,1967
5. Gait disturbances in advanced stages of Parkinson's disease;Giladi,2000