Juliusz Jezierski Mariusz Masewicz Robert Wrembel On Optimising Data Access Via Materialised Methods in Object-Oriented Systems. 47-56 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3261&spage=47 2004 conf/advis/2004 ADVIS db/conf/advis/advis2004.html#JezierskiMW04