@misc{indiciae244001d14c60,
  title = {A practical guide to assisted operating. 6. Basic conservation. 2.},
  author = {E Paul},
  year = {1972},
  doi = {10.1038/sj.bdj.4802937},
  url = {https://pubmed.ncbi.nlm.nih.gov/4511889/},
  note = {Source identifier: 4511889}
}