@misc{indiciaeb0dbe1f44959,
  title = {THEMIS observes possible cave skylights on Mars},
  author = {Glen Cushing and Timothy N. Titus and J. Judson Wynne and P. R. Christensen},
  year = {2007},
  doi = {10.1029/2007gl030709},
  url = {https://pubs.usgs.gov/publication/70031447},
  note = {Source identifier: 70031447}
}