@misc{indiciae21dd2562da77,
  title = {Grades that goad or stay.},
  author = {M Klein},
  year = {1969},
  doi = {10.1056/nejm196902272800929},
  url = {https://pubmed.ncbi.nlm.nih.gov/5763715/},
  note = {Source identifier: 5763715}
}