@misc{indiciae08a23ec26fa7,
  title = {Role of aquitards in hydrogeochemical systems: A synopsis},
  author = {W. Back},
  year = {1986},
  doi = {10.1016/0883-2927(86)90027-2},
  url = {https://pubs.usgs.gov/publication/70015079},
  note = {Source identifier: 70015079}
}