@misc{indiciae96b23631c833,
  title = {Crises in human ecology.},
  author = {J G Harrar},
  year = {1968},
  doi = {10.1073/pnas.61.2.357},
  url = {https://pubmed.ncbi.nlm.nih.gov/5245977/},
  note = {Source identifier: 5245977}
}