@misc{indiciae3b832640fc07,
  title = {Iron isotope biosignatures},
  author = {Beard, B. L. and Johnson, C. M. and Cox, L. and Sun, H. and Nealson, K. H. and Aguilar, C.},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/20040141826},
  note = {Source identifier: 20040141826}
}