@misc{indiciaeb26febd6dcf2,
  title = {Topological four-dimensional self-dual gravity.},
  author = {A Nakamichi and A Sugamoto and I Oda},
  year = {1991},
  doi = {10.1103/physrevd.44.3835},
  url = {https://pubmed.ncbi.nlm.nih.gov/10013855/},
  note = {Source identifier: 10013855}
}