@misc{indiciaeb7860f901213,
  title = {Basic genetical and immunological considerations.},
  author = {R E Billingham},
  year = {1969},
  doi = {10.1073/pnas.63.4.1020},
  url = {https://pubmed.ncbi.nlm.nih.gov/4390985/},
  note = {Source identifier: 4390985}
}