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@article{JRAM_1972__252_151192, author = {Syed A. Huq}, title = {Upper {Central} {Series} in a {Category.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {209--214}, publisher = {mathdoc}, volume = {252}, year = {1972}, zbl = {0235.18004}, url = {http://geodesic.mathdoc.fr/item/JRAM_1972__252_151192/} }
Syed A. Huq. Upper Central Series in a Category.. Journal für die reine und angewandte Mathematik, Tome 252 (1972), pp. 209-214. http://geodesic.mathdoc.fr/item/JRAM_1972__252_151192/