TY  - RPRT
TI  - Negative v positive schizophrenia. Definition and validation.
AU  - N C Andreasen
AU  - S Olsen
PY  - 1982
DO  - 10.1001/archpsyc.1982.04290070025006
UR  - https://pubmed.ncbi.nlm.nih.gov/7165478/
ID  - 7165478
ER  -