Geodesic
The Mac Lane Method of Construction and Classification of Extensions of Cyclic Groups by Their Automorphism Groups
Séminaire lotharingien de combinatoire, Tome 29 (1992) 
M. Kuzma; B. Lulek. The Mac Lane Method of Construction and Classification of Extensions of Cyclic Groups by Their Automorphism Groups. Séminaire lotharingien de combinatoire, Tome 29 (1992). http://geodesic.mathdoc.fr/item/SLC_1992_29_a6/
@article{SLC_1992_29_a6,
     author = {M. Kuzma and B. Lulek},
     title = {The {Mac} {Lane} {Method} of {Construction} and {Classification} of {Extensions} of {Cyclic} {Groups} by {Their} {Automorphism} {Groups}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1992},
     volume = {29},
     url = {http://geodesic.mathdoc.fr/item/SLC_1992_29_a6/}
}
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Voir la notice de l'acte provenant de la source Séminaire Lotharingien de Combinatoire website

The Mac Lane method has been applied to the construction of the second cohomology group in the extension C12 x Aut C12. The method simplifies significantly the difficult problem of construction of nonequivalent extensions and allows to investigate their structure.