@misc{indiciae0f30f5497340,
  title = {Acoustic absorption by sunspots},
  author = {Braun, D. C. and Labonte, B. J. and Duvall, T. L., Jr.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19870062610},
  note = {Source identifier: 19870062610}
}