@misc{indiciaeee18e2582b57,
  title = {Double-bubble spacetimes.},
  author = {JR Ipser},
  year = {1987},
  doi = {10.1103/physrevd.36.1933},
  url = {https://pubmed.ncbi.nlm.nih.gov/9958380/},
  note = {Source identifier: 9958380}
}