TY - JOUR AU - Tauno Metsänkylä TI - An Upper Bound for the ...-Invariant of Imaginary Abelian Fields. JO - Mathematische Annalen PY - 1983 SP - 5 EP - 8 VL - 264 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MAN_1983__264_163766/ ID - MAN_1983__264_163766 ER -