@misc{indiciae9d7e82bc0c32,
  title = {A numerical solution for the diffusion equation in hydrogeologic systems},
  author = {A. L. Ishii and R. W. Healy and Robert G. Striegl},
  year = {1989},
  doi = {10.3133/wri894027},
  url = {https://pubs.usgs.gov/publication/wri894027},
  note = {Source identifier: wri894027}
}