@misc{indiciaea0a404fffb01,
  title = {Two hundred years since Malthus.},
  author = {J A Black},
  doi = {10.1136/bmj.315.7123.1686},
  url = {https://pubmed.ncbi.nlm.nih.gov/9448542/},
  note = {Source identifier: 9448542}
}