@misc{indiciaee391108a13bb,
  title = {A model for a self-directed unit.},
  author = {N R Brunschwyler},
  year = {1991},
  doi = {10.1097/00006247-199101000-00024},
  url = {https://pubmed.ncbi.nlm.nih.gov/1986337/},
  note = {Source identifier: 1986337}
}