title: progressive evaluation of nested aggregate queries cheng hian goh , beng chin ooi , kian-lee tan vldb j.. authors: nan. venue: nan. year: 2000.0
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