1. Observations on essential tremor;Critchley, M.;Brain,1949
2. Essential tremor: A review;Findley, L.J.; Koller, W.C.;Neurology,1987
3. Ad Hoc Committee on the classifications of headache: A classification of headache;Neurology
4. Prevalence of essential tremor in biracial adult population of Copiah County;Haerer, A.F.; Anderson, D.W.; Schoenberg, B.S.,1981
5. The epidemiological enigma of migraine;Waters, W.E.;Int J Epidemiol,1973