TY  - RPRT
TI  - Backward bifurcation in epidemic control.
AU  - K P Hadeler
AU  - P van den Driessche
PY  - 1997
DO  - 10.1016/s0025-5564(97)00027-8
UR  - https://pubmed.ncbi.nlm.nih.gov/9357292/
ID  - 9357292
ER  -