The ICS-FORTH SWIM: A Powerful Semantic Web Integration Middleware. - Vassilis Christophides; Gregory Karvounarakis; Ioanna Koffina; Giorgos Kokkinidis; Aimilia Magkanaraki; Dimitris Plexousakis; Giorgos Serfiotis; Val Tannen (SWDB, 2003)

Integrating XML Data Sources using RDF/S Schemas: The ICS-FORTH Semantic Web Integration Middleware (SWIM). - Ioanna Koffina; Giorgos Serfiotis; Vassilis Christophides; Val Tannen; Alin Deutsch (Semantic Interoperability and Integration, 2005)

Containment and Minimization of RDF/S Query Patterns. - Giorgos Serfiotis; Ioanna Koffina; Vassilis Christophides; Val Tannen (ISWC, 2005)

Mediating RDF/S Queries to Relational and XML Sources. - Ioanna Koffina; Giorgos Serfiotis; Vassilis Christophides; Val Tannen (Int. J. Semantic Web Inf. Syst., 2006)

Mediating RDF/S Queries to Relational and XML Sources. - Ioanna Koffina; Giorgos Serfiotis; Vassilis Christophides; Val Tannen (Database Technologies: Concepts, Methodologies, Tools, and Applications, 2009)