%0 Conference Paper %B Proc. 23rd AAAI Conference on Artificial Intelligence (AAAI'08) %D 2008 %T Expressive Banner Ad auctions and Model-based Online Optimization for Clearing %A Craig Boutilier %A David C. Parkes %A Tuomas Sandholm %A William E. Walsh %B Proc. 23rd AAAI Conference on Artificial Intelligence (AAAI'08) %P 30–37 %G eng %U http://econcs.seas.harvard.edu/files/econcs/files/walsh08_banner.pdf