@misc{indiciaee6ee28d1e326,
  title = {Visibility in space target description subroutine},
  author = {Breckenridge, W. T., Jr. and Dummer, R. S. and Geanacou, J. and Neu, J. T.},
  year = {1965},
  url = {https://ntrs.nasa.gov/citations/19690073041},
  note = {Source identifier: 19690073041}
}