@misc{indiciaed6f199c25053,
  title = {Martian polar cap boundaries, part A Final report},
  author = {Baum, W. A. and Fischbacher, G. E. and Martin, L. J.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700024751},
  note = {Source identifier: 19700024751}
}