@misc{indiciae31bad1e8b558,
  title = {The Oort cloud},
  author = {Marochnik, Leonid S. and Mukhin, Lev M. and Sagdeev, Roald Z.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910013665},
  note = {Source identifier: 19910013665}
}