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@article{CMH_1974__49_139587, author = {Ralph Strebel}, title = {Homological {Methods} {Applied} to the {Derived} {Series} of {Groups}}, journal = {Commentarii mathematici Helvetici}, pages = {302--332}, publisher = {mathdoc}, volume = {49}, year = {1974}, zbl = {0288.20066}, url = {http://geodesic.mathdoc.fr/item/CMH_1974__49_139587/} }
Ralph Strebel. Homological Methods Applied to the Derived Series of Groups. Commentarii mathematici Helvetici, Tome 49 (1974), pp. 302-332. http://geodesic.mathdoc.fr/item/CMH_1974__49_139587/