TY  - RPRT
TI  - Hepatitis B surface antigen variation and protective immunity.
AU  - C R Howard
AU  - L M Allison
PY  - 1995
DO  - 10.1159/000150412
UR  - https://pubmed.ncbi.nlm.nih.gov/8666522/
ID  - 8666522
ER  -