@article{CM_1973__27_1_49_0, author = {Grove, Karsten and Karcher, Hermann}, title = {On pinched manifolds with fundamental group $\mathbf {Z}\_2$}, journal = {Compositio Mathematica}, volume = {27}, year = {1973}, pages = {49-61}, mrnumber = {334244}, zbl = {0266.53032}, language = {en}, url = {http://dml.mathdoc.fr/item/CM_1973__27_1_49_0} }
Grove, Karsten; Karcher, Hermann. On pinched manifolds with fundamental group $\mathbf {Z}_2$. Compositio Mathematica, Tome 27 (1973) pp. 49-61. http://gdmltest.u-ga.fr/item/CM_1973__27_1_49_0/
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