TY  - RPRT
TI  - A simple vaccination model with multiple endemic states.
AU  - C M Kribs-Zaleta
AU  - J X Velasco-Hernández
PY  - 2000
DO  - 10.1016/s0025-5564(00)00003-1
UR  - https://pubmed.ncbi.nlm.nih.gov/10748286/
ID  - 10748286
ER  -