%0 Journal Article %A Dendy, J.E.jun. %T Semicoarsening multigrid for systems %J Electronic transactions on numerical analysis %D 1997 %P 97-105 %V 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/ETNA_1997__6__a13/ %G en %F ETNA_1997__6__a13