TY  - JOUR
AU  - Norman Blackburn
TI  - The Extension Theory of the Symmetric and Alternating Groups.
JO  - Mathematische Zeitschrift
PY  - 1970
SP  - 191
EP  - 206
VL  - 117
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1970__117_171422/
ID  - MZ_1970__117_171422
ER  -