Esteban Feuerstein Pablo Ariel Heiber Javier Martínez-Viademonte Ricardo A. Baeza-Yates New Stochastic Algorithms for Scheduling Ads in Sponsored Search. 22-31 2007 LA-WEB http://doi.ieeecomputersociety.org/10.1109/LA-WEB.2007.42 conf/la-web/2007 db/conf/la-web/la-web2007.html#FeuersteinHMB07