%0 Journal Article %A Tintarev, K. %T Semilinear elliptic problems on unbounded subsets of the Heisenberg group %J Electronic Journal of Differential Equations %D 2001 %V 2001 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2001__2001__a215/ %G en %F EJDE_2001__2001__a215