Steffen Skatulla Stefan Dorendorf Optimization of Storage Structures of Complex Types in Object-Relational Database Systems. 220-235 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2798&spage=220 2003 conf/adbis/2003 ADBIS db/conf/adbis/adbis2003.html#SkatullaD03