@article{GDZPPN002063832, title = {Crossed n-folds extensions of groups and cohomology.}, journal = {Commentarii mathematici Helvetici}, volume = {55}, year = {1980}, pages = {302-313}, zbl = {0443.18019}, url = {http://dml.mathdoc.fr/item/GDZPPN002063832} }
Huebschmann, Johannes. Crossed n-folds extensions of groups and cohomology.. Commentarii mathematici Helvetici, Tome 55 (1980) pp. 302-313. http://gdmltest.u-ga.fr/item/GDZPPN002063832/