@misc{indiciae3e6858096ab4,
  title = {Pattern drilling exploration: Optimum pattern types and hole spacings when searching for elliptical shaped targets},
  author = {L. J. Drew},
  year = {1979},
  doi = {10.1007/bf01028966},
  url = {https://pubs.usgs.gov/publication/70012468},
  note = {Source identifier: 70012468}
}