@misc{indiciae0387febef7f2,
  title = {Letter: Decrease of HB-s Ag titers after repeated freezing and thawing.},
  author = {M Schlaak and H Lehmann and H Schläfer},
  year = {1975},
  doi = {10.1056/nejm197504242921717},
  url = {https://pubmed.ncbi.nlm.nih.gov/1117920/},
  note = {Source identifier: 1117920}
}