TY  - RPRT
TI  - Some epidemiological models with nonlinear incidence.
AU  - H W Hethcote
AU  - P van den Driessche
PY  - 1991
DO  - 10.1007/bf00160539
UR  - https://pubmed.ncbi.nlm.nih.gov/2061695/
ID  - 2061695
ER  -