%0 Journal Article %A Grove, Karsten %A Karcher, Hermann %T On pinched manifolds with fundamental group $\mathbf {Z}_2$ %J Compositio Mathematica %D 1973 %P 49-61 %V 27 %N 1 %I Noordhoff International Publishing %U http://archive.numdam.org/item/CM_1973__27_1_49_0/ %G en %F CM_1973__27_1_49_0