@article{9601,
  author = {John Jefferies and F. Orrall and J. Zirker},
  title = {The interpretation of total line intensities from optically thin gases I. A General Method},
  year = {1972},
  journal = {Solar Physics},
  volume = {22},
  pages = {307-316},
  month = {Jan-02-1972},
  issn = {0038-0938},
  doi = {10.1007/BF00148698},
}