@article{02105205,
title = {Heegaard splittings of graph manifolds.},
journal = {Geometry \& Topology},
volume = {8},
year = {2004},
pages = {831-876},
doi = {10.2140/gt.2004.8.831},
zbl = {1055.57023},
language = {en},
url = {http://dml.mathdoc.fr/item/02105205}
}
Schultens, Jennifer. Heegaard splittings of graph manifolds.. Geometry & Topology, Tome 8 (2004) pp. 831-876. doi : 10.2140/gt.2004.8.831. http://gdmltest.u-ga.fr/item/02105205/