@article{10_2140_agt_2007_7_1119,
     author = {Li, Tao},
     title = {Saddle tangencies and the distance of {Heegaard} splittings},
     journal = {Algebraic and Geometric Topology},
     pages = {1119--1134},
     year = {2007},
     volume = {7},
     number = {2},
     doi = {10.2140/agt.2007.7.1119},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2007.7.1119/}
}