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@article{CMH_1973__48_139533, author = {Erhard Senn}, title = {Der {Funktor} {EXT...(.,} {R)} in endlichen, graduierten {Algebren}}, journal = {Commentarii mathematici Helvetici}, pages = {1--13}, publisher = {mathdoc}, volume = {48}, year = {1973}, zbl = {0258.13006}, url = {http://geodesic.mathdoc.fr/item/CMH_1973__48_139533/} }
Erhard Senn. Der Funktor EXT...(., R) in endlichen, graduierten Algebren. Commentarii mathematici Helvetici, Tome 48 (1973), pp. 1-13. http://geodesic.mathdoc.fr/item/CMH_1973__48_139533/