@misc{indiciaeb45dc2608c6b,
  title = {Biological externalities.},
  author = {G Tullock},
  year = {1971},
  doi = {10.1016/0022-5193(71)90097-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/5170481/},
  note = {Source identifier: 5170481}
}