@article{EJDE_2006__2006__a0,
     author = {Zhou,  Zheng and Zhang,  Zhengqiu},
     title = {Existence and global attractivity positive periodic solutions for a discrete model},
     journal = {Electronic journal of differential equations},
     year = {2006},
     volume = {2006},
     zbl = {1113.39017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a0/}
}