@misc{indiciae251e225462bc,
  title = {Periodic insolation variations on Mars.},
  author = {Murray, B. C. and Ward, W. R. and Yeung, S. C.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730044872},
  note = {Source identifier: 19730044872}
}