TY  - RPRT
TI  - Two SIS epidemiologic models with delays.
AU  - H W Hethcote
AU  - P van den Driessche
PY  - 2000
DO  - 10.1007/s002850050003
UR  - https://pubmed.ncbi.nlm.nih.gov/10663661/
ID  - 10663661
ER  -