@article{05002581,
title = {Heegaard gradient and virtual fibers.},
journal = {Geometry \& Topology},
volume = {5},
year = {2005},
pages = {2227-2259},
doi = {10.2140/gt.2005.9.2227},
zbl = {1100.57002},
language = {en},
url = {http://dml.mathdoc.fr/item/05002581}
}
Maher, Joseph. Heegaard gradient and virtual fibers.. Geometry & Topology, Tome 5 (2005) pp. 2227-2259. doi : 10.2140/gt.2005.9.2227. http://gdmltest.u-ga.fr/item/05002581/