@misc{indiciae31830995e35d,
  title = {Straight line fitting of an observation path by least normal squares},
  author = {William H. Kirby},
  year = {1974},
  doi = {10.3133/ofr74187},
  url = {https://pubs.usgs.gov/publication/ofr74187},
  note = {Source identifier: ofr74187}
}