@article{05002613, title = {Locally unknotted spines of Heegaard splittings.}, journal = {Geometry \& Topology}, volume = {5}, year = {2005}, pages = {1573-1584}, doi = {10.2140/agt.2005.5.1573}, zbl = {1120.57007}, language = {en}, url = {http://dml.mathdoc.fr/item/05002613} }
Johnson, Jesse. Locally unknotted spines of Heegaard splittings.. Geometry & Topology, Tome 5 (2005) pp. 1573-1584. doi : 10.2140/agt.2005.5.1573. http://gdmltest.u-ga.fr/item/05002613/