@misc{indiciae004330374c3e,
  title = {Photon escape probabilities in a semi-infinite plane-parallel medium},
  author = {Williams, A. C. and Elsner, R. F. and Weisskopf, M. C. and Darbro, W.},
  year = {1984},
  url = {https://ntrs.nasa.gov/citations/19840039145},
  note = {Source identifier: 19840039145}
}