@misc{indiciaed21a7b1ef9b4,
  title = {Fossil Stroemgren spheres from supernova explosions},
  author = {Kafatos, M. C. and Morrison, P.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710058355},
  note = {Source identifier: 19710058355}
}