%0 Journal Article %A Ellis, David %T On Infinite Series of Sets %J Glasgow mathematical journal %D 1954 %P 89-92 %V 2 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S2040618500033086/ %R 10.1017/S2040618500033086 %F 10_1017_S2040618500033086