@incollection{raykar_NIPS_2007,
 title = {On Ranking in Survival Analysis: Bounds on the Concordance Index},
 author = {Vikas Raykar and Harald Steck and Balaji Krishnapuram and Cary  Dehing-Oberije and Philippe  Lambin},
 booktitle = {Advances in Neural Information Processing Systems 20},
 editor = {J.C. Platt and D. Koller and Y. Singer and S. Roweis},
 publisher = {MIT Press},
 address = {Cambridge, MA},
 pages = {},
 year = {2008}
}