@misc{indiciaeb94c6f9231a8,
  title = {Hepatitis B surface antigen variation and protective immunity.},
  author = {C R Howard and L M Allison},
  year = {1995},
  doi = {10.1159/000150412},
  url = {https://pubmed.ncbi.nlm.nih.gov/8666522/},
  note = {Source identifier: 8666522}
}