@article{10_2140_agt_2009_9_1727,
     author = {Derbez, Pierre and Wang, Shicheng},
     title = {Finiteness of mapping degrees and {PSL(2,R){\textendash}volume} on graph manifolds},
     journal = {Algebraic and Geometric Topology},
     pages = {1727--1749},
     year = {2009},
     volume = {9},
     number = {3},
     doi = {10.2140/agt.2009.9.1727},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2009.9.1727/}
}