@misc{indiciae03ebb2d070c8,
  title = {Conserved quantities at spatial and null infinity: The Penrose potential.},
  author = {JN Goldberg},
  year = {1990},
  doi = {10.1103/physrevd.41.410},
  url = {https://pubmed.ncbi.nlm.nih.gov/10012346/},
  note = {Source identifier: 10012346}
}