@misc{indiciae751790ea1b87,
  title = {Protrusion, extrusion ... confusion!},
  author = {J D Swartz},
  year = {1993},
  doi = {10.1016/s0887-2171(05)80030-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/8297629/},
  note = {Source identifier: 8297629}
}