@misc{indiciae7dfd7ed4c1b8,
  title = {Electron densities derived from line intensity ratios - Beryllium isoelectronic sequence},
  author = {Dupree, A. K. and Munro, R. H. and Withbroe, G. L.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710063142},
  note = {Source identifier: 19710063142}
}