Xuerui Wang Andrei Z. Broder Marcus Fontoura Vanja Josifovski A note on search based forecasting of ad volume in contextual advertising. 1343-1344 2008 CIKM http://doi.acm.org/10.1145/1458082.1458270 conf/cikm/2008 db/conf/cikm/cikm2008.html#WangBFJ08