title: on computing correlated aggregates over continual data streams divesh srivastava , flip korn , johannes gehrke. authors: nan. venue: sigmod conference. year: 2001.0
title: processing complex aggregate queries over data streams alin dobra , minos garofalakis , johannes gehrke , rajeev rastogi international conference on management of data. authors: nan. venue: nan. year: 2002.0