@misc{indiciae36457e635e5a,
  title = {Crossing the threshold.},
  author = {P Ingham and J Smith},
  year = {1992},
  doi = {10.1016/0960-9822(92)90656-u},
  url = {https://pubmed.ncbi.nlm.nih.gov/15335894/},
  note = {Source identifier: 15335894}
}