@misc{indiciaeec34ee382fce,
  title = {GEOSTAT; a computer system for spherical semi-variogram modeling and kriging},
  author = {L.W. Boger},
  year = {1988},
  doi = {10.3133/ofr88684},
  url = {https://pubs.usgs.gov/publication/ofr88684},
  note = {Source identifier: ofr88684}
}