%0 Journal Article
%A Norman Blackburn
%T The Extension Theory of the Symmetric and Alternating Groups.
%J Mathematische Zeitschrift
%D 1970
%P 191-206
%V 117
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1970__117_171422/
%F MZ_1970__117_171422