@misc{indiciaeb178f6422987,
  title = {Topological two-form gravity in four dimensions.},
  author = {HY Lee and A Nakamichi and T Ueno},
  year = {1993},
  doi = {10.1103/physrevd.47.1563},
  url = {https://pubmed.ncbi.nlm.nih.gov/10015733/},
  note = {Source identifier: 10015733}
}