1. Diagnostic and Statistical Manual of Mental Disorders,1987
2. Catatonia: a review of a behavioral neurologic syndrome;Taylor;Neuropsychiatry, Neuropsychology and Behavioral Neurology,1990
3. Problems in diagnosing bipolar disorder in catatonic patients;Fein;J Clin Psychiatry,1990
4. Catatonia: a prospective clinical study;Abrams;Arch Gen Psychiatry,1976
5. Catatonia: excited and retarded types;Morrison;Arch Gen Psychiatry,1973