TY  - RPRT
TI  - Multiple attractors in the response to a vaccination program.
AU  - J L Aron
PY  - 1990
DO  - 10.1016/0040-5809(90)90003-e
UR  - https://pubmed.ncbi.nlm.nih.gov/2399511/
ID  - 2399511
ER  -