Nonmotor Fluctuations in Patients with Parkinson's Disease
Neurol 47:1180-1183, Hillen,M.E.&Sage,J.I., 1996
Neurologic Aspects of Cobalamin Deficiency
Medicine 70:229-245, Healton,E.B.,et al, 1991
Causalgia and Other Reflex Sympathetic Dystrophies
In the Management of Pain, Lea & Febiger, Phila, p. 220, Bonica,J.J., 1990