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@article{CMH_1955__29_139092, author = {Jean-Pierre Serre}, title = {Un th\'eor\`eme de dualit\'e.}, journal = {Commentarii mathematici Helvetici}, pages = {9--26}, publisher = {mathdoc}, volume = {29}, year = {1955}, zbl = {0067.16101}, url = {http://geodesic.mathdoc.fr/item/CMH_1955__29_139092/} }
Jean-Pierre Serre. Un théorème de dualité.. Commentarii mathematici Helvetici, Tome 29 (1955), pp. 9-26. http://geodesic.mathdoc.fr/item/CMH_1955__29_139092/