@misc{indiciae5b98625b11ea,
  title = {Spectral Distinctions between the Leading and Trailing Hemispheres of Callisto: New Observations},
  author = {W. M. Calvin and R. N. Clark},
  year = {1993},
  doi = {10.1006/icar.1993.1083},
  url = {https://pubs.usgs.gov/publication/70017348},
  note = {Source identifier: 70017348}
}