@misc{indiciae5e25f353e8e7,
  title = {The local interstellar helium density},
  author = {Freeman, J. and Paresce, F. and Bowyer, S. and Lampton, M. and Stern, R. and Margon, B.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770056589},
  note = {Source identifier: 19770056589}
}