Integration und Suche in Digitalen Bibliotheken: Ein logikbasierter Ansatz. - Ulrich Thiel; André Everts; Barbara Lutes; Kostas Tzeras (Inform. Forsch. Entwickl., 1998)

Can Rule-Based Indexing Support Concept-Based Multimedia Retrieval in Digital Libraries? Some Experimental Results. - Ulrich Thiel; André Everts; Barbara Lutes; Adelheit Stein (MIRA, 1999)