@article{GDZPPN002203677, title = {On the product formula in Galois groups.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, volume = {372}, year = {1986}, pages = {172-183}, zbl = {0608.12011}, url = {http://dml.mathdoc.fr/item/GDZPPN002203677} }
Wingberg, Kay. On the product formula in Galois groups.. Journal für die reine und angewandte Mathematik, Tome 372 (1986) pp. 172-183. http://gdmltest.u-ga.fr/item/GDZPPN002203677/