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@article{MZ_1970__117_171422, author = {Norman Blackburn}, title = {The {Extension} {Theory} of the {Symmetric} and {Alternating} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {191--206}, publisher = {mathdoc}, volume = {117}, year = {1970}, zbl = {0205.32401}, url = {http://geodesic.mathdoc.fr/item/MZ_1970__117_171422/} }
Norman Blackburn. The Extension Theory of the Symmetric and Alternating Groups.. Mathematische Zeitschrift, Tome 117 (1970), pp. 191-206. http://geodesic.mathdoc.fr/item/MZ_1970__117_171422/