@misc{indiciae07697bba731c,
  title = {Copper absorption from I.U.C.D.s.},
  author = {M Elstein and B Daunter},
  year = {1973},
  doi = {10.1136/bmj.2.5869.776-a},
  url = {https://pubmed.ncbi.nlm.nih.gov/4718330/},
  note = {Source identifier: 4718330}
}