@article{GDZPPN002100584, title = {Hegaard genus of closed orientable Seifert 3-manifolds.}, journal = {Inventiones mathematicae}, volume = {75}, year = {1984}, pages = {455-468}, zbl = {0538.57004}, url = {http://dml.mathdoc.fr/item/GDZPPN002100584} }
Boileau, M.; Zieschang, H. Hegaard genus of closed orientable Seifert 3-manifolds.. Inventiones mathematicae, Tome 75 (1984) pp. 455-468. http://gdmltest.u-ga.fr/item/GDZPPN002100584/