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@article{MAN_1982__259_163624, author = {Werner Ballmann}, title = {Axial {Isometries} of {Manifolds} of {Non-Positive} {Curvature.}}, journal = {Mathematische Annalen}, pages = {131--144}, publisher = {mathdoc}, volume = {259}, year = {1982}, zbl = {0487.53039}, url = {http://geodesic.mathdoc.fr/item/MAN_1982__259_163624/} }
Werner Ballmann. Axial Isometries of Manifolds of Non-Positive Curvature.. Mathematische Annalen, Tome 259 (1982), pp. 131-144. http://geodesic.mathdoc.fr/item/MAN_1982__259_163624/