@misc{indiciaeac5d038bd87d,
  title = {Comparison of basic modes for imaging the earth},
  author = {Alden P. Colvocoresses},
  year = {1970},
  doi = {10.2514/3.30117},
  url = {https://pubs.usgs.gov/publication/70226549},
  note = {Source identifier: 70226549}
}