Pierre Derbez, Shicheng Wang. Graph manifolds have virtually positive Seifert volume. J. London Math. Society, 86(1):17-35, 2012. [doi]
@article{DerbezW12,
title = {Graph manifolds have virtually positive Seifert volume},
author = {Pierre Derbez and Shicheng Wang},
year = {2012},
doi = {10.1112/jlms/jdr085},
url = {http://dx.doi.org/10.1112/jlms/jdr085},
researchr = {https://researchr.org/publication/DerbezW12},
cites = {0},
citedby = {0},
journal = {J. London Math. Society},
volume = {86},
number = {1},
pages = {17-35},
}