S. Vrochidis, C. Doulaverakis, A. Gounaris, E. Nidelkou, L. Makris and I. Kompatsiaris. “A Hybrid Ontology and Visual-based Retrieval Model for Cultural Heritage Multimedia Collections“. International Journal of Metadata, Semantics and Ontologies, Vol.3, No. 3, pp. 167-182, 28 February 2009.