@misc{indiciaeeee021592215,
  title = {Iron isotope biosignatures.},
  author = {B L Beard and C M Johnson and L Cox and H Sun and K H Nealson and C Aguilar},
  year = {1999},
  doi = {10.1126/science.285.5435.1889},
  url = {https://pubmed.ncbi.nlm.nih.gov/10489362/},
  note = {Source identifier: 10489362}
}