TY - JOUR AU - Robbiano, Lorenzo TI - A theorem on normal flatness JO - Compositio Mathematica PY - 1979 SP - 293 EP - 298 VL - 38 IS - 3 PB - Sijthoff et Noordhoff International Publishers UR - http://www.numdam.org/item/CM_1979__38_3_293_0/ LA - en ID - CM_1979__38_3_293_0 ER -