@misc{indiciae4e4e0123989f,
  title = {A knotty problem.},
  author = {M R England and M C Murphy},
  year = {1997},
  doi = {10.1016/s1053-0770(97)90041-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/9263107/},
  note = {Source identifier: 9263107}
}