1. Panofski, E.: Meaning in the Visual Arts: Papers in and on Art History. Doubleday, Garden City (1955)
2. Krause, M.G.: Intellectual problems of indexing picture collections. Audiov. Librarian 14, 73–81 (1988)
3. Markey, K.: Access to iconographical research collections. Libr. Trends 37, 154–174 (1988)
4. Armitage, L.H., Enser, P.G.B.: Analysis of user need in image archives. J. Inf. Sci. 23, 287–299 (1997)
5. Jörgensen, C.: Attributes of images in describing tasks. Inf. Process. Manag. 34, 161–174 (1998)