@misc{indiciaeec2c7946a889,
  title = {Pumping tests in non-uniform aquifers - The linear strip case},
  author = {J.J. Butler and W.Z. Liu},
  year = {1991},
  doi = {10.1016/0022-1694(91)90132-2},
  url = {https://pubs.usgs.gov/publication/70016484},
  note = {Source identifier: 70016484}
}