@misc{indiciae9eeb02fa48ef,
  title = {North-south geological differences between the residual polar caps on Mars},
  author = {P.C. Thomas and M. C. Malin and K.S. Edgett and M. H. Carr and W.K. Hartmann and A.P. Ingersoll and P.B. James and L.A. Soderblom and J. Veverka and R. Sullivan},
  year = {2000},
  doi = {10.1038/35004528},
  url = {https://pubs.usgs.gov/publication/70022909},
  note = {Source identifier: 70022909}
}