@misc{indiciae6ec117a828bc,
  title = {Two degree system maintained.},
  author = {D E Francke},
  year = {1978},
  doi = {10.1177/106002807801200808},
  url = {https://pubmed.ncbi.nlm.nih.gov/10237346/},
  note = {Source identifier: 10237346}
}