Jukka Kiviniemi Antoni Wolski Antti Pesonen Johannes Arminen Lazy Aggregates for Real-Time OLAP. 165-172 http://link.springer.de/link/service/series/0558/bibs/1676/16760165.htm 1999 conf/dawak/1999 DaWaK db/conf/dawak/dawak99.html#KiviniemiWPA99