1. A rating scale for emotional blunting;Abrams;American Journal of Psychiatry,1978
2. The signs and symptoms of schizophrenia;Alpert,1985
3. Negative symptoms in schizophrenia: Definition and reliability;Andreasen;Archives of General Psychiatry,1982
4. The Scale for the Assessment of Negative Symptoms (SANS);Andreasen,1984
5. The Scale for the Assessment of Positive Symptoms (SANS);Andreasen,1984