@misc{indiciae77551c13e11d,
  title = {First premolar or second premolar extractions: formula or clinical judgment?},
  author = {D H Ketterhagen},
  year = {1979},
  doi = {10.1043/0003-3219(1979)049<0190:fpospe>2.0.co;2},
  url = {https://pubmed.ncbi.nlm.nih.gov/290284/},
  note = {Source identifier: 290284}
}