@misc{indiciae4efa33eab648,
  title = {Detecting potassium on Mercury},
  author = {Killen, R. M. and Potter, A. E. and Morgan, T. H.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910053627},
  note = {Source identifier: 19910053627}
}