@article{10_2140_agt_2006_6_539,
     author = {Saeki, Osamu},
     title = {Cobordism of {Morse} functions on surfaces, the universal complex of singular fibers and their application to map germs},
     journal = {Algebraic and Geometric Topology},
     pages = {539--572},
     year = {2006},
     volume = {6},
     number = {2},
     doi = {10.2140/agt.2006.6.539},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2006.6.539/}
}