%0 Journal Article %A Colding, Tobias %A Minicozzi, William, II %T Estimates for the extinction time for the Ricci flow on certain 3-manifolds and a question of Perelman %J Journal of the American Mathematical Society %D 2005 %P 561-569 %V 18 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-05-00486-8/ %R 10.1090/S0894-0347-05-00486-8 %F 10_1090_S0894_0347_05_00486_8