TY - JOUR AU - Grove, Karsten AU - Karcher, Hermann TI - On pinched manifolds with fundamental group $\mathbf {Z}_2$ JO - Compositio Mathematica PY - 1973 SP - 49 EP - 61 VL - 27 IS - 1 PB - Noordhoff International Publishing UR - http://archive.numdam.org/item/CM_1973__27_1_49_0/ LA - en ID - CM_1973__27_1_49_0 ER -