@misc{indiciae728007c3ef11,
  title = {Negative v positive schizophrenia. Definition and validation.},
  author = {N C Andreasen and S Olsen},
  year = {1982},
  doi = {10.1001/archpsyc.1982.04290070025006},
  url = {https://pubmed.ncbi.nlm.nih.gov/7165478/},
  note = {Source identifier: 7165478}
}