Dennis Pedersen Karsten Riis Torben Bach Pedersen Cost Modeling and Estimation for OLAP-XML Federations. 245-254 2002 conf/dawak/2002 DaWaK http://link.springer.de/link/service/series/0558/bibs/2454/24540245.htm db/conf/dawak/dawak2002.html#PedersenRP02