1. Jason Behrstock. Asymptotic geometry of the mapping class group and Teichmüller space. Ph.D. thesis, SUNY Stony Brook, 2004. http://www.math.columbia.edu/∼jason/thesis.pdf.
2. Thick metric spaces, relative hyperbolicity, and quasi-isometric rigidity;Behrstock, Jason;Math. Ann.,2009
3. Quasi-homomorphisms on mapping class groups;Bestvina, Mladen;Glas. Mat. Ser. III,2007
4. The topology of 3-manifolds, Heegaard distance and the mapping class group of a 2-manifold;Birman, Joan S.,2006
5. Cobordism of automorphisms of surfaces;Bonahon, Francis;Ann. Sci. \'{E}cole Norm. Sup. (4),1983