@misc{indiciaeb91fe9d05a7f,
  title = {Organic substances in produced and formation water from unconventional natural gas extraction in coal and shale},
  author = {William H. Orem and Calin A. Tatu and Matthew S. Varonka and Harry E. Lerch and Anne L. Bates and Mark A. Engle and Lynn M. Crosby and Jennifer McIntosh},
  year = {2014},
  doi = {10.1016/j.coal.2014.01.003},
  url = {https://pubs.usgs.gov/publication/70108091},
  note = {Source identifier: 70108091}
}