@article{EJDE_2008__2008__a98,
     author = {Deng,  Shengbing and Yang,  Jianfu},
     title = {Critical {Neumann} problem for nonlinear elliptic systems in exterior domains},
     journal = {Electronic journal of differential equations},
     year = {2008},
     volume = {2008},
     zbl = {1173.35446},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2008__2008__a98/}
}