@misc{indiciaeedabdffc2dfc,
  title = {Biological nitrogen fixation.},
  author = {R H Burris and G P Roberts},
  year = {1993},
  doi = {10.1146/annurev.nu.13.070193.001533},
  url = {https://pubmed.ncbi.nlm.nih.gov/8369149/},
  note = {Source identifier: 8369149}
}