Non-positively curved graph manifolds are virtually fibered over the circle
arXiv:math/0108010
Abstract
In this note we prove that any closed graph manifold admitting a metric of non-positive sectional curvature (NPC-metric) has a finite cover, which is fibered over the circle. An explicit criterion to have a finite cover, which is fibered over the circle, is presented for the graph manifolds of certain class.
10 pages, AMSTeX