@misc{indiciae18fd909d2d94,
  title = {Thresholds in development.},
  author = {J Lewis and J M Slack and L Wolpert},
  year = {1977},
  doi = {10.1016/0022-5193(77)90216-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/859349/},
  note = {Source identifier: 859349}
}