%0 Journal Article %A Costa, David G. %T On a class of elliptic systems in $\Bbb R^n$ %J Electronic Journal of Differential Equations %D 1994 %V 1994 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_1994__1994_7_a0/ %G en %F EJDE_1994__1994_7_a0