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3. Mental retardation: Nature, cause, and management;Baroff,1974
4. Baumeister, A. A. (1978). Origins and control of stereotyped movements. In C. E. Meyers (Ed.). Quality of life in severely and profoundly mentally retarded people: Research foundations for improvement (Monograph No. 3). Washington, DC: American Association for Mental Deficiency.
5. Stereotyped acts;Baumeister,1973