@misc{indiciae2f1e2babefb7,
  title = {Three-derivatives in three dimensions.},
  author = {I Bengtsson},
  year = {1989},
  doi = {10.1103/physrevd.39.667},
  url = {https://pubmed.ncbi.nlm.nih.gov/9959684/},
  note = {Source identifier: 9959684}
}