@misc{indiciae0dfcce8c51b2,
  title = {Atlas of cometary forms - Structures near the nucleus},
  author = {Donn, B. and Rahe, J. and Wurm, K.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700002956},
  note = {Source identifier: 19700002956}
}