%0 Journal Article %A McWilliams, R.D. %T On the $w^*$-sequential closure of subspaces of Banach spaces %J Portugaliae mathematica %D 1963 %P 209-214 %V 22 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1963__22_4_114911/ %G en %F PORMA_1963__22_4_114911