@misc{indiciae432861334232,
  title = {Sleep and depression. IV. Longitudinal studies.},
  author = {J Mendels and D R Hawkins},
  year = {1971},
  doi = {10.1097/00005053-197110000-00004},
  url = {https://pubmed.ncbi.nlm.nih.gov/4329776/},
  note = {Source identifier: 4329776}
}