TY - JOUR AU - Patrick Eberlein TI - A Canonical Form for Compact Nonpositively Curved Manifolds Whose Fundamental Groups Have Nontrivial Center. JO - Mathematische Annalen PY - 1982 SP - 23 EP - 30 VL - 260 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MAN_1982__260_163652/ ID - MAN_1982__260_163652 ER -