@misc{indiciaeade13a582613,
  title = {International reference ionosphere 1990},
  author = {Bilitza, Dieter and Rawer, K. and Bossy, L. and Kutiev, I. and Oyama, K.-I. and Leitinger, R. and Kazimirovsky, E.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910021307},
  note = {Source identifier: 19910021307}
}