6Steele J, Richardson J, Olszewski J. Progressive supranuclear palsy : a het-erogeneous degeneration involving the brainstem, basal gangli- a and cerebellum with vertical gaze and pseudobulbar palsy, nuchal dystonia and dementia [J]. Arch Neurol, 1964, 10 (4) : 333 -359.
7Litvan I. Up date on progressive supranuclear palsy [J]. Curr Neural Neurosci Rep, 2004, 4 (4): 296-302.