@misc{indiciae81d401cd4f2e,
  title = {Letter: C3 standards.},
  author = {A E Stitzel and R E Spitzer},
  year = {1975},
  doi = {10.1016/s0140-6736(75)92804-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/51166/},
  note = {Source identifier: 51166}
}