@article{EJDE_2011__2011__a9,
     author = {Nguyen Thanh Chung},
     title = {Existence of infinitely many solutions for degenerate and singular elliptic systems with indefinite concave nonlinearities},
     journal = {Electronic journal of differential equations},
     year = {2011},
     volume = {2011},
     zbl = {1220.35036},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2011__2011__a9/}
}