@misc{indiciaeb3c1649c8bfd,
  title = {Methods for assessing positive and negative symptoms.},
  author = {N C Andreasen},
  year = {1990},
  doi = {10.1159/000418013},
  url = {https://pubmed.ncbi.nlm.nih.gov/2336066/},
  note = {Source identifier: 2336066}
}