@misc{indiciae9a2fbccf9c0b,
  title = {Isotopic identification of the source of methane in subsurface sediments of an area surrounded by waste disposal facilities},
  author = {Keith C. Hackley and Chao-Li Liu and D. Trainor},
  year = {1999},
  doi = {10.1016/s0883-2927(98)00036-5},
  url = {https://pubs.usgs.gov/publication/70021975},
  note = {Source identifier: 70021975}
}