@misc{indiciaee238d86428ed,
  title = {Mottled terrain - A continuing Martian enigma},
  author = {Scott, D. H. and Underwood, J. R., Jr.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910057754},
  note = {Source identifier: 19910057754}
}