@article{EJDE_2007__2007__a127,
     author = {Ma,  Shuang-Hong and Sun,  Jian-Ping and Wang,  Da-Bin},
     title = {Existence of positive solutions for nonlinear dynamic systems with a parameter on a measure chain},
     journal = {Electronic journal of differential equations},
     year = {2007},
     volume = {2007},
     zbl = {1142.34321},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a127/}
}