@misc{indiciaecea0ceff1dd7,
  title = {Photoperiodic effects on tumor development and immune function.},
  author = {R J Nelson and J M Blom},
  year = {1994},
  doi = {10.1177/074873049400900305},
  url = {https://pubmed.ncbi.nlm.nih.gov/7772792/},
  note = {Source identifier: 7772792}
}