@misc{indiciae76d1c3ddded9,
  title = {A modification to the N.B.T. test.},
  author = {R Freeman and B King},
  year = {1971},
  doi = {10.1016/s0140-6736(71)91312-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/4107432/},
  note = {Source identifier: 4107432}
}