@article{GDZPPN002407523,
title = {The Extension Theory of the Symmetric and Alternating Groups.},
journal = {Mathematische Zeitschrift},
volume = {114},
year = {1970},
pages = {191-206},
zbl = {0205.32401},
url = {http://dml.mathdoc.fr/item/GDZPPN002407523}
}
Blackburn, Norman. The Extension Theory of the Symmetric and Alternating Groups.. Mathematische Zeitschrift, Tome 114 (1970) pp. 191-206. http://gdmltest.u-ga.fr/item/GDZPPN002407523/