@article{10191,
  author = {R. Milkey and R. Shine and D. Mihalas},
  title = {Resonance line transfer with partial redistribution. IV - A generalized formulation for lines with common upper states. V - The solar CA II lines},
  year = {1975},
  journal = {The Astrophysical Journal},
  volume = {199},
  pages = {718},
  month = {Jan-08-1975},
  issn = {0004-637X},
  url = {http://articles.adsabs.harvard.edu/full/1975ApJ...199..718M},
  doi = {10.1086/153743},
}