@misc{indiciae31b1c4739782,
  title = {Spontaneous pneumoperitoneum. Two case reports.},
  author = {I S Russell and K J Hardy},
  year = {1965},
  doi = {10.1111/j.1445-2197.1965.tb06228.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/5213370/},
  note = {Source identifier: 5213370}
}