@misc{indiciae29b91d2e8fba,
  title = {Earth resources.},
  author = {B J Skinner},
  year = {1979},
  doi = {10.1073/pnas.76.9.4212},
  url = {https://pubmed.ncbi.nlm.nih.gov/16592706/},
  note = {Source identifier: 16592706}
}