%0 Journal Article %A Robbiano, Lorenzo %T A theorem on normal flatness %J Compositio Mathematica %D 1979 %P 293-298 %V 38 %N 3 %I Sijthoff et Noordhoff International Publishers %U http://www.numdam.org/item/CM_1979__38_3_293_0/ %G en %F CM_1979__38_3_293_0