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@article{MAN_1986__274_164083, author = {Viktor Schroeder}, title = {Rigidity of {Nonpositively} {Curved} {Graphmanifolds.}}, journal = {Mathematische Annalen}, pages = {19--26}, publisher = {mathdoc}, volume = {274}, year = {1986}, zbl = {0591.53038}, url = {http://geodesic.mathdoc.fr/item/MAN_1986__274_164083/} }
Viktor Schroeder. Rigidity of Nonpositively Curved Graphmanifolds.. Mathematische Annalen, Tome 274 (1986), pp. 19-26. http://geodesic.mathdoc.fr/item/MAN_1986__274_164083/