TY  - RPRT
TI  - Immunological memory and protective immunity: understanding their relation.
AU  - R Ahmed
AU  - D Gray
PY  - 1996
DO  - 10.1126/science.272.5258.54
UR  - https://pubmed.ncbi.nlm.nih.gov/8600537/
ID  - 8600537
ER  -