@misc{indiciaec981993facbe,
  title = {The martian hemispheric dichotomy may be due to a giant impact},
  author = {D.E. Wilhelms and S. W. Squyres},
  year = {1984},
  doi = {10.1038/309138a0},
  url = {https://pubs.usgs.gov/publication/70013630},
  note = {Source identifier: 70013630}
}