@article{9128,
  author = {John Cooper and R. Ballagh and Ivan Hubeny},
  title = {Approximate formulation of redistribution in the Ly-alpha, Ly-beta, H-alpha system},
  year = {1989},
  journal = {The Astrophysical Journal},
  volume = {344},
  pages = {949},
  month = {Jan-09-1989},
  issn = {0004-637X},
  url = {http://articles.adsabs.harvard.edu/full/1989ApJ...344..949C},
  doi = {10.1086/167863},
}