@misc{indiciae930e75252fbb,
  title = {Reduced helium abundances in nebulae},
  author = {Cox, D. P. and Daltabuit, E. and Robbins, R. R.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710062384},
  note = {Source identifier: 19710062384}
}