@misc{indiciae2b09e6fd45bb,
  title = {The Markellis Card: an immunization system.},
  author = {V C Markellis},
  year = {1973},
  doi = {10.1111/j.1746-1561.1973.tb03714.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/4488077/},
  note = {Source identifier: 4488077}
}