@misc{indiciae31d60b9be6bc,
  title = {The Ellis formula.},
  author = {J B Healy},
  year = {1973},
  doi = {10.1259/0007-1285-46-548-644-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/4783063/},
  note = {Source identifier: 4783063}
}