%0 Journal Article
%A Zhang, Tailei
%A Liu, Junli
%A Teng, Zhidong
%T Existence of positive periodic solutions of an SEIR model with periodic coefficients
%J Applications of Mathematics
%D 2012
%P 601-616
%V 57
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.1007/s10492-012-0036-5/
%R 10.1007/s10492-012-0036-5
%G en
%F 10_1007_s10492_012_0036_5