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@article{MAN_1986__276_164196, author = {Michael T. Anderson}, title = {On the {Fundamental} {Group} of {Non-Positively} {Curved} {Manifolds.}}, journal = {Mathematische Annalen}, pages = {269--278}, publisher = {mathdoc}, volume = {276}, year = {1986}, zbl = {0608.53037}, url = {http://geodesic.mathdoc.fr/item/MAN_1986__276_164196/} }
Michael T. Anderson. On the Fundamental Group of Non-Positively Curved Manifolds.. Mathematische Annalen, Tome 276 (1986), pp. 269-278. http://geodesic.mathdoc.fr/item/MAN_1986__276_164196/