@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/