@article{10853,
  author = {B. Haisch},
  title = {Radiative transfer in spherical dust shells using a generalized two-stream Eddington approximation},
  year = {1979},
  journal = {Astronomy and Astrophysics},
  volume = {72},
  pages = {161-170},
  url = {http://adsabs.harvard.edu/full/1979A\%26A....72..161H},
  note = {JILA Pub. 1919},
}