@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/