Patrick Ziegler Klaus R. Dittrich User-Specific Semantic Integration of Heterogeneous Data: The SIRUP Approach. 44-64 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3226&spage=44 2004 conf/icsnw/2004 ICSNW db/conf/icsnw/icsnw2004.html#ZieglerD04