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Neurol 40:1171-1176, Goossens,L.A.Z.,et al, 1990
Activation of Epileptiform Activity by Mental Arithmetic
Arch Neurol 43:624-626, Anderson,N.E.&Wallis,W.E., 1986
Seizures Induced by Thinking
Ann Neurol 11:608-612, Wilkins,A.J.,et al, 1982
EEG Activation & Mathematical Calculation
Neurol 29:1499-1503, Wiebers,D.O.,et al, 1979