Geodesic
Nonpositively-curved graph manifolds are virtually fibered over the circle
Zapiski Nauchnykh Seminarov POMI, Geometry and topology. Part 7, Tome 280 (2001), pp. 272-277 Cet article a éte moissonné depuis la source Math-Net.Ru

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A proof of the following result is announced. Each nonpositively-curved closed graph manifold has a finite cover that fibers over the circle. 
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     author = {P. V. Svetlov},
     title = {Nonpositively-curved graph manifolds are virtually fibered over the circle},
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     pages = {272--277},
     year = {2001},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_2001_280_a19/}
}
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P. V. Svetlov. Nonpositively-curved graph manifolds are virtually fibered over the circle. Zapiski Nauchnykh Seminarov POMI, Geometry and topology. Part 7, Tome 280 (2001), pp. 272-277. http://geodesic.mathdoc.fr/item/ZNSL_2001_280_a19/