Meng-Feng Tsai Wesley W. Chu A Multidimensional Aggregation Object (MAO) Framework for Computing Distributive Aggregations. 45-54 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2737&spage=45 2003 conf/dawak/2003 DaWaK db/conf/dawak/dawak2003.html#TsaiC03