A Relevance Model Based Filter for Improving Ad Quality, Raghavan, Hema, and Hillard Dustin , In Proceedings of The 32nd Annual ACM SIGIR Conference, 07/2009, Boston, MA, (2009)

Discovering users' specific geo intention in web search, Yi, Xing, Raghavan Hema, and Leggetter Chris , WWW '09: Proceedings of the 18th international conference on World wide web, New York, NY, USA, p.481–490, (2009)