@misc{indiciae09daa64bc910,
  title = {Multiple source components in gas manifestations from north-central Italy},
  author = {A. Minissale and William C. Evans and G. Magro and O. Vaselli},
  year = {1997},
  doi = {10.1016/s0009-2541(97)00081-8},
  url = {https://pubs.usgs.gov/publication/70019551},
  note = {Source identifier: 70019551}
}