@misc{indiciae923ab3333975,
  title = {Molecular carbon isotopic evidence for the origin of geothermal hydrocarbons},
  author = {D.J. Des Marais and J.H. Donchin and N.L. Nehring and A.H. Truesdell},
  year = {1981},
  doi = {10.1038/292826a0},
  url = {https://pubs.usgs.gov/publication/70011851},
  note = {Source identifier: 70011851}
}