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2. Observations on essential (heredo-familial) tremor;Critchley, M.;Brain,1949
3. Essential tremor. A clinical and genetic population study;Larsson, T.; Sjogren, T.;Acta psychiat. neurol. scand,1960
4. A method of recording small movements;Rushworth, G.; Willison, R.G.;Lancet,1960