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@article{JRAM_1986__368_152844, author = {Kay Wingberg}, title = {On the product formula in {Galois} groups.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {172--183}, publisher = {mathdoc}, volume = {368}, year = {1986}, zbl = {0608.12011}, url = {http://geodesic.mathdoc.fr/item/JRAM_1986__368_152844/} }
Kay Wingberg. On the product formula in Galois groups.. Journal für die reine und angewandte Mathematik, Tome 368 (1986), pp. 172-183. http://geodesic.mathdoc.fr/item/JRAM_1986__368_152844/