@article{10_1090_S0894_0347_05_00486_8,
     author = {Colding, Tobias and Minicozzi, William, II},
     title = {Estimates for the extinction time for the {Ricci} flow on certain 3-manifolds and a question of {Perelman}},
     journal = {Journal of the American Mathematical Society},
     pages = {561--569},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {2005},
     doi = {10.1090/S0894-0347-05-00486-8},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-05-00486-8/}
}