@misc{indiciae6510cfc67619,
  title = {The use of groundwater age as a calibration target},
  author = {Leonard F. Konikow and G.Z. Hornberger and L.D. Putnam and A.M. Shapiro and B.A. Zinn},
  year = {2008},
  url = {https://pubs.usgs.gov/publication/70032422},
  note = {Source identifier: 70032422}
}