@misc{indiciae35f4b6b569ea,
  title = {N(h) profile data at World Data Centers},
  author = {Allen, J. H. and Conkright, R. and Bilitza, D. and Feldstein, A. IA. and Willis, D. M.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19900034519},
  note = {Source identifier: 19900034519}
}