@misc{indiciaebd01a6872853,
  title = {A simple analytic approximation for dusty stromgren spheres.},
  author = {Petrosian, V. and Silk, J. and Field, G. B.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19730026245},
  note = {Source identifier: 19730026245}
}