@misc{indiciae09895d1678fe,
  title = {A direct protein-binding assay for 25-hydroxycalciferol.},
  author = {G Offermann and F Dittmar},
  year = {1974},
  doi = {10.1055/s-0028-1095742},
  url = {https://pubmed.ncbi.nlm.nih.gov/4375660/},
  note = {Source identifier: 4375660}
}