%0 Journal Article %A Macdonald, I. D. %T On a set of normal subgroups %J Glasgow mathematical journal %D 1962 %P 137-146 %V 5 %N 3 %U http://geodesic.mathdoc.fr/articles/10.1017/S204061850003447X/ %R 10.1017/S204061850003447X %F 10_1017_S204061850003447X