@article{PORMA_1963__22_4_114911,
     author = {McWilliams, R.D.},
     title = {On the $w^*$-sequential closure of subspaces of {Banach} spaces},
     journal = {Portugaliae mathematica},
     pages = {209--214},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {1963},
     zbl = {0132.08904},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1963__22_4_114911/}
}