@misc{indiciaee1b651da1557,
  title = {Algebra and the circle system.},
  author = {P J Horsey},
  year = {1982},
  doi = {10.1093/bja/54.5.571-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/7073926/},
  note = {Source identifier: 7073926}
}