Hans-Jörg Schek The Hyperdatabase Network - New Middleware for Searching and Maintaining the Information Space. 42-46 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3381&spage=42 2005 conf/sofsem/2005 SOFSEM db/conf/sofsem/sofsem2005.html#Schek05