%0 Journal Article %A Bejenaru, Ioan %A Diaz, Jesus Ildefonso %A Vrabie, Ioan I. %T An abstract approximate controllability result and applications to elliptic and parabolic systems with dynamic boundary conditions %J Electronic Journal of Differential Equations %D 2001 %V 2001 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2001__2001__a173/ %G en %F EJDE_2001__2001__a173