Ricardo A. Baeza-Yates Aristides Gionis Flavio Junqueira Vanessa Murdock Vassilis Plachouras Fabrizio Silvestri The impact of caching on search engines. 183-190 2007 conf/sigir/2007 SIGIR http://doi.acm.org/10.1145/1277741.1277775 db/conf/sigir/sigir2007.html#Baeza-YatesGJMPS07