1. Scale for the Assessment of Negative Symptoms (SANS);Andreasen,1984
2. Scale for the Assessment of Positive Symptoms (SAPS);Andreasen,1984
3. Negative versus positive schizophrenia: definition and validation;Andreasen;Archives of General Psychiatry,1982
4. Tests of significance in factor analysis;Bartlett;British Journal of Psychology,1950
5. La Perte de l'Évidence Naturelle;Blankenburg,1990