Christian BorgsJennifer T. ChayesNicole ImmorlicaKamal JainOmid EtesamiMohammad MahdianDynamics of bid optimization in online advertisement auctions.531-5402007conf/www/2007WWWhttps://doi.org/10.1145/1242572.1242644db/conf/www/www2007.html#BorgsCIJEM07