@misc{indiciaea306d9cdae9d,
  title = {Neutral hydrogen in cometary comas.},
  author = {Mendis, D. A. and Holzer, T. E. and Axford, W. I.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19730027940},
  note = {Source identifier: 19730027940}
}