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“, in Proceedings of 2nd International Conference on Metadata and Semantics Research, Metadata and Semantics, 11-12 October, Corfu, Greece, 2007, Springer US, pp. 1-10. https://doi.org/10.1007/978-0-387-77745-0_1