@misc{indiciaeeb20f853bde0,
  title = {A method of converting no-flow cells to variable-head cells for the U. S. Geological Survey modular finite-difference ground-water flow model},
  author = {Michael G. McDonald and Arlen W. Harbaugh and Brennon R. Orr and Daniel J. Ackerman},
  year = {1991},
  doi = {10.3133/ofr91536},
  url = {https://pubs.usgs.gov/publication/ofr91536},
  note = {Source identifier: ofr91536}
}