1. American Psychiatric Association. DSM-III-R: Diagnostic and Statistical Manual of Mental Disorders,1987
2. The Scale for the Assessment of Negative Symptoms (SANS);Andreasen,1983
3. Screening depressed patients in clinical practice: A rapid technique;Beck;Postgrad. Med.,1972
4. Positive and negative signals: A conceptual history;Berrios,1991
5. Nonpharmacological treatment concepts of negative symptomatology;Brenner,1991