1. Diagnostic and Statistical Manual of Mental Disorders,1994
2. Scale for the Assessment of Negative Symptoms (SANS);Andreasen,1983
3. Scale for the Assessment of Positive Symptoms (SAPS);Andreasen,1984
4. Positive vs. negative schizophrenia: a critical evaluation;Andreasen;Schizophr. Bull.,1985
5. Evaluation of positive and negative symptoms in schizophrenia;Andreasen;Psychiatr. Biol.,1986