@misc{indiciae6e4de05fbe07,
  title = {Spatial and temporal distributions of Martian north polar cold spots before, during, and after the global dust storm of 2001},
  author = {C. Cornwall and T.N. Titus},
  year = {2009},
  doi = {10.1029/2008je003243},
  url = {https://pubs.usgs.gov/publication/70035689},
  note = {Source identifier: 70035689}
}