@misc{indiciaefa53bf071ce2,
  title = {Characteristic microwave-background distortions from collapsing spherical domain walls},
  author = {Goetz, Guenter and Notzold, Dirk},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910027720},
  note = {Source identifier: 19910027720}
}