@article{05029612, title = {Cobordism of Morse functions on surfaces, the universal complex of singular fibers and their application to map germs.}, journal = {Geometry \& Topology}, volume = {6}, year = {2006}, pages = {539-572}, doi = {10.2140/agt.2006.6.539}, zbl = {1098.57017}, language = {en}, url = {http://dml.mathdoc.fr/item/05029612} }
Saeki, Osamu. Cobordism of Morse functions on surfaces, the universal complex of singular fibers and their application to map germs.. Geometry & Topology, Tome 6 (2006) pp. 539-572. doi : 10.2140/agt.2006.6.539. http://gdmltest.u-ga.fr/item/05029612/