@misc{indiciae7a112b9dbce1,
  title = {Variation in biological availability.},
  author = {M E Williams and M J Kendall and M Mitchard},
  year = {1973},
  doi = {10.1016/s0140-6736(73)90316-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/4119766/},
  note = {Source identifier: 4119766}
}