@misc{indiciae477126036611,
  title = {A new extradural space indicator.},
  author = {C P Bahl},
  year = {1977},
  doi = {10.1093/bja/49.4.392-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/889655/},
  note = {Source identifier: 889655}
}