@misc{indiciae23d773fe3734,
  title = {Examining the P matrix.},
  author = {GA Crawford and GA Miller},
  year = {1987},
  doi = {10.1103/physrevd.35.1707},
  url = {https://pubmed.ncbi.nlm.nih.gov/9957839/},
  note = {Source identifier: 9957839}
}