Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1971__46_139482, author = {B. Eckmann and P.J. Hilton}, title = {On {Central} {Group} {Extensions} and {Homology}}, journal = {Commentarii mathematici Helvetici}, pages = {345--355}, publisher = {mathdoc}, volume = {46}, year = {1971}, zbl = {0232.18011}, url = {http://geodesic.mathdoc.fr/item/CMH_1971__46_139482/} }
B. Eckmann; P.J. Hilton. On Central Group Extensions and Homology. Commentarii mathematici Helvetici, Tome 46 (1971), pp. 345-355. http://geodesic.mathdoc.fr/item/CMH_1971__46_139482/