TY  - JOUR
AU  - Zhang, Tailei
AU  - Liu, Junli
AU  - Teng, Zhidong
TI  - Existence of positive periodic solutions of an SEIR model with periodic coefficients
JO  - Applications of Mathematics
PY  - 2012
SP  - 601
EP  - 616
VL  - 57
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.1007/s10492-012-0036-5/
DO  - 10.1007/s10492-012-0036-5
LA  - en
ID  - 10_1007_s10492_012_0036_5
ER  -