@misc{indiciaefb91c0a2fb48,
  title = {H2 in expanding circumstellar shells},
  author = {Hollenbach, D. and Chu, S.-I. and Mccray, R.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19760061720},
  note = {Source identifier: 19760061720}
}