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@article{MZ_1972__128_171794, author = {Urs Stammbach}, title = {Varietal {Homology} and {Parafree} {Groups.}}, journal = {Mathematische Zeitschrift}, pages = {153--168}, publisher = {mathdoc}, volume = {128}, year = {1972}, zbl = {0253.20076}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__128_171794/} }
Urs Stammbach. Varietal Homology and Parafree Groups.. Mathematische Zeitschrift, Tome 128 (1972), pp. 153-168. http://geodesic.mathdoc.fr/item/MZ_1972__128_171794/