TY  - JOUR
AU  - Zeng,  Zhijun
TI  - Existence of positive periodic solutions for a class of nonautonomous difference equations
JO  - Electronic journal of differential equations
PY  - 2006
VL  - 2006
UR  - http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a188/
LA  - en
ID  - EJDE_2006__2006__a188
ER  -