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@InProceedings{Broder:2009:OER,
author = "Andrei Broder and Peter Ciccolo and Evgeniy Gabrilovich and Vanja Josifovski and Donald Metzler and Lance Riedel and Jeffrey Yuan",
title = "Online Expansion of Rare Queries for Sponsored Search",
booktitle = "Proceedings of the 18th International World Wide Web Conference",
booktitle1 = "WWW'09",
pages = "511--520",
month = "April",
year = 2009
}