@misc{indiciae14cf0f9aab26,
  title = {Mandatory or elective?},
  author = {J M Jensen},
  year = {2001},
  doi = {10.14219/jada.archive.2001.0138},
  url = {https://pubmed.ncbi.nlm.nih.gov/11217584/},
  note = {Source identifier: 11217584}
}