@misc{indiciaef2cdc02867f6,
  title = {Experience gained in testing a theory for modelling groundwater flow in heterogeneous media},
  author = {S. Christensen and R.L. Cooley},
  year = {2002},
  url = {https://pubs.usgs.gov/publication/70023927},
  note = {Source identifier: 70023927}
}