@article{GDZPPN002327813,
title = {Rigidity of Nonpositively Curved Graphmanifolds.},
journal = {Mathematische Annalen},
volume = {275},
year = {1986},
pages = {19-26},
zbl = {0591.53038},
url = {http://dml.mathdoc.fr/item/GDZPPN002327813}
}
Schroeder, Viktor. Rigidity of Nonpositively Curved Graphmanifolds.. Mathematische Annalen, Tome 275 (1986) pp. 19-26. http://gdmltest.u-ga.fr/item/GDZPPN002327813/