@article{EJDE_2001__2001__a137,
     author = {Tintarev,  K.},
     title = {Semilinear elliptic problems on unbounded subsets of the {Heisenberg} group},
     journal = {Electronic journal of differential equations},
     year = {2001},
     volume = {2001},
     zbl = {0988.35051},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2001__2001__a137/}
}