@article{11588,
  author = {D. van Blerkom and David Hummer},
  title = {The normalized on-the-spot approximation for line transfer problems},
  year = {1969},
  journal = {Journal of Quantitative Spectroscopy and Radiative Transfer},
  volume = {9},
  pages = {1567-1571},
  month = {Jan-11-1969},
  issn = {00224073},
  doi = {10.1016/0022-4073(69)90027-2},
}