@misc{indiciaec05404e1d9af,
  title = {Calibration changes in EUV solar satellite instruments},
  author = {Parkinson, W. H. and Reeves, E. M.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700011059},
  note = {Source identifier: 19700011059}
}