@misc{indiciae35432d766599,
  title = {Circularity of Martian craters.},
  author = {Oberbeck, V. R. and Aoyagi, M. and Murray, J. B.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19730052998},
  note = {Source identifier: 19730052998}
}