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J Neuro-Ophthalmol 15:236-240, Brodsky,M.C.&Boop,F.A., 1995
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Neurol 42 917-919, Ragge,N.K.&Hoyt,W.F., 1992
Ptosis and Supranuclear Downgaze Paralysis
Neurol 39:385-389, Buttner-Ennever,J.A.,et al, 1989