@misc{indiciaeea4d5720fb2d,
  title = {The extraordinary radar echoes from Europa, Ganymede, and Callisto: A geological perspective},
  author = {S.J. Ostro and E.M. Shoemaker},
  year = {1990},
  doi = {10.1016/0019-1035(90)90121-o},
  url = {https://pubs.usgs.gov/publication/70016218},
  note = {Source identifier: 70016218}
}