title: processing complex aggregate queries over data streams a dobra , m garofalakis , j gehrke , r rastogi. authors: nan. venue: sigmod conference. year: 2002.0
title: multiple aggregations over data streams proceedings of the 2005 acm sigmod international conference & hellip ; ,. authors: r zhang , n koudas , bc ooi , d srivastava. venue: nan. year: 2005.0